Add list view tests

Also,
 * moved fetch out of the list view
 * removed unused #last() function
 * put test setup lines in their own tiny file.
 * added data-cover to view script tags for code coveage reports.

js/views/conversation_view.js

@@ -12,6 +12,7 @@ var Whisper = Whisper || {};
       this.$el.html(Mustache.render(this.template));
 
       this.view = new Whisper.MessageListView({collection: this.model.messages()});
+      this.model.messages().fetch({reset: true});
       this.$el.find('.discussion-container').append(this.view.el);
     },
     events: {