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.
Bootstrap may not be installed depending on how the generator's questions are answered.