Branch name does not appear in Newsfeed or Recent Activity listing (BB-7392)

When a commit is made to any branch. Newsfeed and Recent Activity notifications do not include name of the branch. However, HipChat notification includes such information. Newsfeed should also include this extra information.

In Newsfeed or Recent Activity Listing

#!markdown

XYZ committed to xyz/my_repo
4 hours ago
4ac0c56 - more minor edits for some markdown syntax

But in Hipchat

#!markdown

XYZ committed to 1 branch at /xyz/my_repo/
On branch "readme_update"
- more minor edits for some markdown syntax (4ac0c56bd5f7)