Add TorrentCollection class and store torrents by hash

shared/util/stringUtil.js

@@ -0,0 +1,21 @@
+'use strict';
+
+let stringUtil = {
+  capitalize: function (string) {
+    return string.charAt(0).toUpperCase() + string.slice(1);
+  },
+
+  pluralize: function (string, count) {
+    if (count !== 1) {
+      if (string.charAt(string.length - 1) === 'y') {
+        return `${string.substring(0, string.length - 1)}ies`;
+      } else {
+        return `${string}s`;
+      }
+    }
+
+    return string;
+  }
+}
+
+module.exports = stringUtil;