Merge pull request #1 from cben/master

don't swallow hunk at end of file
Use green instead of blue for additions.
Bold blue works fine for colordiff, but we need dark (non-bold) blue and it's hard to read on black background.

I tried cyan but it's harder to read than blue on white background.
Green is a win accross black, white and ubuntu-purple backgrounds.

Besides, red/green makes sense and is what everybody uses (from Trac and Meld to git diff).