Update CreateEvent template and set activities to populate only after the header.
Added PullRequestEvent and IssuesEvent.
Update activity events to look more like GitHub's.
- Update when a pull request has been merged to say merge, as well as
  display a message with commits, additions, and deletions.
- Add MD5 functionality to display commit user's gravatars on PushEvents.
Add time to each activity. Fix CreateEvent to support repository creation.