Library to parse and apply unified diffs.

Features:
* Python 2 and 3 compatible
* Automatic correction of
   - Linefeeds according to patched file
   - Diffs broken by stripping trailing whitespace
   - a/ and b/ prefixes
* Single file, which is a command line tool and a library
* No dependencies outside Python stdlib
* Patch format detection (SVN, HG, GIT)
* Nice diffstat histogram
* Linux / Windows / OS X
* Test coverage