Add ZSH git completion to fix extreme slowness with tab completion

From: http://sourceforge.net/p/zsh/code/ci/master/tree/Completion/Unix/Command/_git

git-svn-id: http://svn.shatow.net/shells@241 ea227b21-592c-dd11-b15d-00012992a58a
Support ~/.gitconfig.local (Requires git 1.7.10)

git-svn-id: http://svn.shatow.net/shells@242 ea227b21-592c-dd11-b15d-00012992a58a
Use pathogen to load vim-ruby

git-svn-id: http://svn.shatow.net/shells@243 ea227b21-592c-dd11-b15d-00012992a58a
Undo this stupid import

git-svn-id: http://svn.shatow.net/shells@244 ea227b21-592c-dd11-b15d-00012992a58a
Use symlinks to install

git-svn-id: http://svn.shatow.net/shells@245 ea227b21-592c-dd11-b15d-00012992a58a
Convert to git checkout

git-svn-id: http://svn.shatow.net/shells@246 ea227b21-592c-dd11-b15d-00012992a58a