Refactor conversation list view

Pull apart UI classes for displaying and creating threads.
Also get rid of ugly alert popup in favor of Whisper.notify.

js/popup.js

@@ -19,6 +19,9 @@ textsecure.registerOnLoadFunction(function() {
 	if (textsecure.storage.getUnencrypted("number_id") === undefined) {
 		extension.navigator.tabs.create("options.html");
 	} else {
+
+		new Whisper.ConversationListView();
+		new Whisper.ConversationComposeView({el: $('body')});
 		$('.my-number').text(textsecure.storage.getUnencrypted("number_id").split(".")[0]);
 		textsecure.storage.putUnencrypted("unreadCount", 0);
 		extension.navigator.setBadgeText("");