Better consistency in repo segments

+ Added [g] and [s] to differentiate repos.
+ Removed separate colors for SVN (only repo colors would be used throughout)
+ Inside svn repo, it showed no segment. Now it shows delta and untracked count.

![screenshot from 2013-11-02 20 15 09](https://f.cloud.github.com/assets/1577944/1459298/a348e330-43cd-11e3-9e2c-4938a2fb9bcf.png)