Remove commit indicator from path on Commits tab [UI]

After: removed the "commit" after the breadcrumb path:

![screenshot from 2014-11-16 17 20 51 after](https://cloud.githubusercontent.com/assets/1429315/5062151/f202eb58-6db4-11e4-988f-398390d3a245.png)

Before:

![](https://cloud.githubusercontent.com/assets/1429315/5043398/20f24d54-6be5-11e4-908c-9377218b8580.png)

I think that "commits" looks weird just a after the breadcrumb as it looks like part of the path, and we are already on the Commits tab, so it is redundant.