Merge pull request #24 from tuxinaut/master

Fix indent, Strip traling spaces and convert tabs to spaces
Added callback function to tweak prompt dynamicly
Merge pull request #25 from danil/master

Added callback function to tweak prompt dynamicly
Update gitstatus.py

Added a version independent print function to gitstatus.py so this prompt can also be used with Python versions older than 2.6

Fixes #26