commented mayor line for now
fixed js line
Starts implementing 'tweet to my councilmember about this issue' story.

- in index, we need to switch to https (secure) link to twitter code to make the commenting work.
- for now, just uses the twitter button code from https://dev.twitter.com/docs/tweet-button

Pivotal: starts [#72808018]
Merge remote-tracking branch 'upstream/master'
added the mentions tab