Bug fixes

- Fixed videos overlapping time ago text in comments
- Added missing `</div>` in user index template
- Fixed this [bug](http://forums.hummingbird.me/t/large-write-something-boxes/13891/) causing the div container for the post textarea to cover the side bar on mobile (switching between the side bar and activity feed is still buggy but I'll fix that once it's confirmed that this issue is resolved)
- Removed a transition for the comment reply field added in bffa31b407d9f62117cf62786e25f0a7c68914d7.  Since the field is only tall enough for one line of text, it caused the text to jump during the transition when going to a new line
- Added model.user property to belongsToUser for Issue #221. @vikhyat added server side support for deleting comments with this [commit](https://github.com/hummingbird-me/hummingbird/commit/79cb57f02e96a979c374591b7de41d455484a271) but on the client side users still don't have the option to delete comments. I *believe* this should allow that.