Add nofmt_printer to color.py

The current printer always expands on the arguments which is a problem
for strings containing %.

Instead of forcing manual string expansion before printing allow for a
no format printer option which simply accepts and prints the string.

Part of fix for issue #131:
http://code.google.com/p/git-repo/issues/detail?id=131

Change-Id: I08ef94b9c4ddab58ac12d2bd32ebd2c413e4f83b
1 file changed