Fixes and tweaks to make tests work with babelized code

* Use mocha, chai & sinon from the npm. As of sinon 2.0
  sinon-as-promised is no longer required so it is removed
* Tweak code to re-use the same loader with the same environment
  throghout the code
* Introduce browserify step for testing tools that only provide
  node-compatible libraries (sinon, chai-as-promised)
* Introduce copy step for test data to resolve multiple issues with
  tests depending on files not being symlinks
* Re-introduce custom implementation of setTimeout to resolve issues
  with few tests
* Re-introduce custom Bluebird Promises config & monkey patch

resource/require.js

@@ -0,0 +1,25 @@
+'use strict';
+
+var EXPORTED_SYMBOLS = ['require'];
+
+var require = (function() {
+	var { Loader, Require, Module } = Components.utils.import('resource://gre/modules/commonjs/toolkit/loader.js');
+	var requirer = Module('/', '/');
+	var _runningTimers = {};
+
+	var loader = Loader({
+		id: 'zotero/require',
+		paths: {
+			'': 'resource://zotero/',
+		},
+		globals: {
+			document: typeof document !== 'undefined' && document || {},
+			console: typeof console !== 'undefined' && console || {},
+			navigator: typeof navigator !== 'undefined' && navigator || {},
+			window,
+			Zotero: typeof Zotero !== 'undefined' && Zotero || {} 
+		}
+	});
+
+	return Require(loader, requirer);
+})();