diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index bef8074..0000000
--- a/yarn.lock
+++ /dev/null
@@ -1,406 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-"@types/ajv@^1.0.0":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/ajv/-/ajv-1.0.0.tgz#4fb2440742f2f6c30e7fb0797b839fc6f696682a"
-  dependencies:
-    ajv "*"
-
-"@types/chai@^4.1.3":
-  version "4.1.3"
-  resolved "https://registry.yarnpkg.com/@types/chai/-/chai-4.1.3.tgz#b8a74352977a23b604c01aa784f5b793443fb7dc"
-
-"@types/mocha@^5.2.0":
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.0.tgz#b3c8e69f038835db1a7fdc0b3d879fc50506e29e"
-
-"@types/node@^8.0.7":
-  version "8.10.17"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-8.10.17.tgz#d48cf10f0dc6dcf59f827f5a3fc7a4a6004318d3"
-
-ajv@*, ajv@^6.5.0:
-  version "6.5.4"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.5.4.tgz#247d5274110db653706b550fcc2b797ca28cfc59"
-  dependencies:
-    fast-deep-equal "^2.0.1"
-    fast-json-stable-stringify "^2.0.0"
-    json-schema-traverse "^0.4.1"
-    uri-js "^4.2.2"
-
-ansi-regex@^2.0.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
-
-ansi-styles@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
-
-ansi-styles@^3.2.1:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
-  dependencies:
-    color-convert "^1.9.0"
-
-argparse@^1.0.7:
-  version "1.0.10"
-  resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
-  dependencies:
-    sprintf-js "~1.0.2"
-
-assertion-error@^1.0.1:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
-
-babel-code-frame@^6.22.0:
-  version "6.26.0"
-  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
-  dependencies:
-    chalk "^1.1.3"
-    esutils "^2.0.2"
-    js-tokens "^3.0.2"
-
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-
-brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
-browser-stdout@1.3.1:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/browser-stdout/-/browser-stdout-1.3.1.tgz#baa559ee14ced73452229bad7326467c61fabd60"
-
-builtin-modules@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
-
-chai@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.1.2.tgz#0f64584ba642f0f2ace2806279f4f06ca23ad73c"
-  dependencies:
-    assertion-error "^1.0.1"
-    check-error "^1.0.1"
-    deep-eql "^3.0.0"
-    get-func-name "^2.0.0"
-    pathval "^1.0.0"
-    type-detect "^4.0.0"
-
-chalk@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
-  dependencies:
-    ansi-styles "^2.2.1"
-    escape-string-regexp "^1.0.2"
-    has-ansi "^2.0.0"
-    strip-ansi "^3.0.0"
-    supports-color "^2.0.0"
-
-chalk@^2.3.0:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
-  dependencies:
-    ansi-styles "^3.2.1"
-    escape-string-regexp "^1.0.5"
-    supports-color "^5.3.0"
-
-check-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
-
-color-convert@^1.9.0:
-  version "1.9.1"
-  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.1.tgz#c1261107aeb2f294ebffec9ed9ecad529a6097ed"
-  dependencies:
-    color-name "^1.1.1"
-
-color-name@^1.1.1:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
-
-commander@2.15.1, commander@^2.12.1:
-  version "2.15.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
-
-concat-map@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
-
-debug@3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-3.1.0.tgz#5bb5a0672628b64149566ba16819e61518c67261"
-  dependencies:
-    ms "2.0.0"
-
-deep-eql@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-3.0.1.tgz#dfc9404400ad1c8fe023e7da1df1c147c4b444df"
-  dependencies:
-    type-detect "^4.0.0"
-
-diff@3.5.0, diff@^3.2.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
-
-es6-object-assign@^1.0.3:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/es6-object-assign/-/es6-object-assign-1.1.0.tgz#c2c3582656247c39ea107cb1e6652b6f9f24523c"
-
-escape-string-regexp@1.0.5, escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
-
-esprima@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.0.tgz#4499eddcd1110e0b218bacf2fa7f7f59f55ca804"
-
-esutils@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
-
-fast-deep-equal@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
-
-fast-json-stable-stringify@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz#d5142c0caee6b1189f87d3a76111064f86c8bbf2"
-
-fs.realpath@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
-
-fsrun@^0.9.4:
-  version "0.9.4"
-  resolved "https://registry.yarnpkg.com/fsrun/-/fsrun-0.9.4.tgz#950105f66c0c03379aa66f9f4cf42077585ebd4e"
-
-get-func-name@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
-
-glob@7.1.2, glob@^7.0.0, glob@^7.1.1:
-  version "7.1.2"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
-  dependencies:
-    fs.realpath "^1.0.0"
-    inflight "^1.0.4"
-    inherits "2"
-    minimatch "^3.0.4"
-    once "^1.3.0"
-    path-is-absolute "^1.0.0"
-
-growl@1.10.5:
-  version "1.10.5"
-  resolved "https://registry.yarnpkg.com/growl/-/growl-1.10.5.tgz#f2735dc2283674fa67478b10181059355c369e5e"
-
-has-ansi@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
-  dependencies:
-    ansi-regex "^2.0.0"
-
-has-flag@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
-
-he@1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
-
-inflight@^1.0.4:
-  version "1.0.6"
-  resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
-  dependencies:
-    once "^1.3.0"
-    wrappy "1"
-
-inherits@2:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
-
-interpret@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.1.0.tgz#7ed1b1410c6a0e0f78cf95d3b8440c63f78b8614"
-
-js-tokens@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
-
-js-yaml@^3.7.0:
-  version "3.11.0"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
-  dependencies:
-    argparse "^1.0.7"
-    esprima "^4.0.0"
-
-json-schema-traverse@^0.4.1:
-  version "0.4.1"
-  resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
-
-minimatch@3.0.4, minimatch@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
-  dependencies:
-    brace-expansion "^1.1.7"
-
-minimist@0.0.8:
-  version "0.0.8"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
-
-minimist@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
-
-mkdirp@0.5.1:
-  version "0.5.1"
-  resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
-  dependencies:
-    minimist "0.0.8"
-
-mocha@^5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-5.2.0.tgz#6d8ae508f59167f940f2b5b3c4a612ae50c90ae6"
-  dependencies:
-    browser-stdout "1.3.1"
-    commander "2.15.1"
-    debug "3.1.0"
-    diff "3.5.0"
-    escape-string-regexp "1.0.5"
-    glob "7.1.2"
-    growl "1.10.5"
-    he "1.1.1"
-    minimatch "3.0.4"
-    mkdirp "0.5.1"
-    supports-color "5.4.0"
-
-ms@2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
-
-once@^1.3.0:
-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
-  dependencies:
-    wrappy "1"
-
-path-is-absolute@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
-
-path-parse@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.5.tgz#3c1adf871ea9cd6c9431b6ea2bd74a0ff055c4c1"
-
-pathval@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/pathval/-/pathval-1.1.0.tgz#b942e6d4bde653005ef6b71361def8727d0645e0"
-
-punycode@^2.1.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
-
-rechoir@^0.6.2:
-  version "0.6.2"
-  resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
-  dependencies:
-    resolve "^1.1.6"
-
-resolve@^1.1.6, resolve@^1.3.2:
-  version "1.7.1"
-  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.7.1.tgz#aadd656374fd298aee895bc026b8297418677fd3"
-  dependencies:
-    path-parse "^1.0.5"
-
-semver@^5.3.0:
-  version "5.5.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
-
-shelljs@^0.7.3:
-  version "0.7.8"
-  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
-  dependencies:
-    glob "^7.0.0"
-    interpret "^1.0.0"
-    rechoir "^0.6.2"
-
-shx@^0.2.2:
-  version "0.2.2"
-  resolved "https://registry.yarnpkg.com/shx/-/shx-0.2.2.tgz#0a304d020b0edf1306ad81570e80f0346df58a39"
-  dependencies:
-    es6-object-assign "^1.0.3"
-    minimist "^1.2.0"
-    shelljs "^0.7.3"
-
-sprintf-js@~1.0.2:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
-
-strip-ansi@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
-  dependencies:
-    ansi-regex "^2.0.0"
-
-supports-color@5.4.0, supports-color@^5.3.0:
-  version "5.4.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.4.0.tgz#1c6b337402c2137605efe19f10fec390f6faab54"
-  dependencies:
-    has-flag "^3.0.0"
-
-supports-color@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
-
-tslib@^1.8.0, tslib@^1.8.1:
-  version "1.9.1"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.1.tgz#a5d1f0532a49221c87755cfcc89ca37197242ba7"
-
-tslint@^5.10.0:
-  version "5.10.0"
-  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.10.0.tgz#11e26bccb88afa02dd0d9956cae3d4540b5f54c3"
-  dependencies:
-    babel-code-frame "^6.22.0"
-    builtin-modules "^1.1.1"
-    chalk "^2.3.0"
-    commander "^2.12.1"
-    diff "^3.2.0"
-    glob "^7.1.1"
-    js-yaml "^3.7.0"
-    minimatch "^3.0.4"
-    resolve "^1.3.2"
-    semver "^5.3.0"
-    tslib "^1.8.0"
-    tsutils "^2.12.1"
-
-tsutils@^2.12.1:
-  version "2.27.1"
-  resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-2.27.1.tgz#ab0276ac23664f36ce8fd4414daec4aebf4373ee"
-  dependencies:
-    tslib "^1.8.1"
-
-type-detect@^4.0.0:
-  version "4.0.8"
-  resolved "https://registry.yarnpkg.com/type-detect/-/type-detect-4.0.8.tgz#7646fb5f18871cfbb7749e69bd39a6388eb7450c"
-
-typescript-bundle@^0.8.6:
-  version "0.8.9"
-  resolved "https://registry.yarnpkg.com/typescript-bundle/-/typescript-bundle-0.8.9.tgz#8d27323e25fcf2fb3231d20508b6e0f2cd7e40bd"
-
-typescript@^2.4.2:
-  version "2.8.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.8.3.tgz#5d817f9b6f31bb871835f4edf0089f21abe6c170"
-
-uri-js@^4.2.2:
-  version "4.2.2"
-  resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-4.2.2.tgz#94c540e1ff772956e2299507c010aea6c8838eb0"
-  dependencies:
-    punycode "^2.1.0"
-
-wrappy@1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"