Update to styling and minor bugfixes.
- Add ref_type for CreateEvent to show the type of creation, such as branch, tag, etc.
- Add commit/addition/deletion info to PullRequestEvent.
- Wrap activity in <small></small> for WatchEvent, FollowEvent, and CreateEvent to better match GitHub's public activity stream.
- Set padding-top: 20px for username in header when name is not present to resolve alignment issue.