Squashed 'vim/.vim/bundle/vim-fugitive/' changes from c1664de..51cdb1b

51cdb1b Cater for powershell as well as cmd for windows users

git-subtree-dir: vim/.vim/bundle/vim-fugitive
git-subtree-split: 51cdb1b190f14d6f2509ffbba363402a951b8312
Merge commit 'aca7e7c4f372f70eac3039c9edaa3f29d168a63b'