Smaller production builds

Builds on the exclusion of PropTypes from production builds:

- Remove 'lodash' and use smaller modules for equivalent functions.
- Remove use of some unnecessary Facebook utilities.
- Remove 'TouchableBounce'; it isn't part of React Native anymore.
- Remove stray import of 'react-dom/server'.
- Exclude 'StyleSheetValidation' from production.

Measuring the UMD build (gzip)…

Before: ~100KB
After: ~60KB

package.json

@@ -19,11 +19,13 @@
   },
   "dependencies": {
     "animated": "^0.1.3",
+    "array-find-index": "^1.0.2",
     "babel-plugin-transform-react-remove-prop-types": "^0.2.11",
     "babel-runtime": "^6.11.6",
+    "debounce": "^1.0.0",
+    "deep-assign": "^2.0.0",
     "fbjs": "^0.8.4",
     "inline-style-prefixer": "^2.0.1",
-    "lodash": "^4.15.0",
     "react-dom": "~15.3.2",
     "react-textarea-autosize": "^4.0.4",
     "react-timer-mixin": "^0.13.3",