Recipe: Changed redshank from darcs to git.

Also added :website http://www.foldr.org/~michaelw/emacs/redshank/.
The repo seems to have switched from darcs to git.
http://www.foldr.org/~michaelw/projects/gitweb?p=redshank.git

Signed-off-by: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
Merge pull request #1133 from ruediger/redshank-git

Recipe: Changed redshank from darcs to git.