Remove uneeded render

This is an artifact of a time when conversation elements would pop in
and out of the dom at a moment's notice, and thus needed to rebind their
event listeners regularly.

js/conversation_panel.js

@@ -25,6 +25,6 @@
         window.document.title = conversation.getTitle();
         new Whisper.ConversationView({
             model: conversation
-        }).render().$el.prependTo($('body'));
+        }).$el.prependTo($('body'));
     });
 }());