Fixes:

http://code.google.com/p/reviewboard/issues/detail?id=451

Server code should still be backwards compatible with old unmodified versions of post-commit, as it only assumes the diff paths are absolute if they begin with a leadling slash

I've only just started using this software and I don't really know my way around the code yet, so I don't know if I've done this the right way by you guys... please let me know :) Also I'm not sure what people/groups this should be going to, but I picked some at random :)

Made sure server still works with old version of post-review

Tested posting & reposting a review for unswitched and switched files, some addd, some modified, some deleted.

svn only