Push updates to conversations

[skord]

So I've had to use some pretty craptastic chat apps, thought is that upon submission, the comment is pushed via web socket and appended to the end of the comment list.

This is preferable over polling every X seconds as:

• Target platform is Heroku, polling for updates when there aren't any can tie up dyno time
• Conditional gets would bypass that problem, but have been problematic in this app due other document.ready things like timeago being ignored when this is the behavior. This could be overcome by the use of polling with conditional gets to a JSON representation of the comments and other ways.