update chat ctrl and add bootstrap to chat page. fix wiredep gruntfile issue.

Hi,

I added some bootstrap styling to the chat template. I used simpleLogin to retrieve logged in user in chat ctrl and save name along with message in firebase. I moved some init code in the chat controller into an init function. Also, I disabled the chat route when a user is not logged in. Finally, I included a fix for the bower.json wiredep issue when building with grunt. Let me know what you think... thanks.
The chat demo should work whether or not simple login is installed (since it is optional in the config process)