Initializes the plugin, this will be executed after the plugin has been created.
This call is done before the editor instance has finished it's initialization so use the onInit event
of the editor instance to intercept that event.

@method init
@param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
@param {string} url Absolute URL to where the plugin is located.
function(ed, url) {
			var self = this, settings = ed.settings;

			self.editor = ed;

			// Parses the specified time string into a milisecond number 10m, 10s etc.
			function parseTime(time) {
				var multipels = {
					s : 1000,
					m : 60000
				};

				time = /^(\d+)([ms]?)$/.exec('' + time);

				return (time[2] ? multipels[time[2]] : 1) * parseInt(time);
			};

			// Default config
			tinymce.each({
				ask_before_unload : TRUE,
				interval : '30s',
				retention : '20m',
				minlength : 50
			}, function(value, key) {
				key = PLUGIN_NAME + '_' + key;

				if (settings[key] === undefined)
					settings[key] = value;
			});

			// Parse times
			settings.autosave_interval = parseTime(settings.autosave_interval);
			settings.autosave_retention = parseTime(settings.autosave_retention);

			// Register restore button
			ed.addButton(RESTORE_DRAFT, {
				title : PLUGIN_NAME + ".restore_content",
				onclick : function() {
					if (ed.getContent({draft: true}).replace(/\s|&nbsp;|<\/?p[^>]*>|<br[^>]*>/gi, "").length > 0) {
						// Show confirm dialog if the editor isn't empty
						ed.windowManager.confirm(
							PLUGIN_NAME + ".warning_message",
							function(ok) {
								if (ok)
									self.restoreDraft();
							}
						);
					} else
						self.restoreDraft();
				}
			});

			// Enable/disable restoredraft button depending on if there is a draft stored or not
			ed.onNodeChange.add(function() {
				var controlManager = ed.controlManager;

				if (controlManager.get(RESTORE_DRAFT))
					controlManager.setDisabled(RESTORE_DRAFT, !self.hasDraft());
			});

			ed.onInit.add(function() {
				// Check if the user added the restore button, then setup auto storage logic
				if (ed.controlManager.get(RESTORE_DRAFT)) {
					// Setup storage engine
					self.setupStorage(ed);

					// Auto save contents each interval time
					setInterval(function() {
						if (!ed.removed) {
							self.storeDraft();
							ed.nodeChanged();
						}
					}, settings.autosave_interval);
				}
			});

			/**
			 * This event gets fired when a draft is stored to local storage.
			 *
			 * @event onStoreDraft
			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
			 * @param {Object} draft Draft object containing the HTML contents of the editor.
			 */
			self.onStoreDraft = new Dispatcher(self);

			/**
			 * This event gets fired when a draft is restored from local storage.
			 *
			 * @event onStoreDraft
			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
			 * @param {Object} draft Draft object containing the HTML contents of the editor.
			 */
			self.onRestoreDraft = new Dispatcher(self);

			/**
			 * This event gets fired when a draft removed/expired.
			 *
			 * @event onRemoveDraft
			 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
			 * @param {Object} draft Draft object containing the HTML contents of the editor.
			 */
			self.onRemoveDraft = new Dispatcher(self);

			// Add ask before unload dialog only add one unload handler
			if (!unloadHandlerAdded) {
				window.onbeforeunload = tinymce.plugins.AutoSave._beforeUnloadHandler;
				unloadHandlerAdded = TRUE;
			}
		}