Squashed '.vim/bundle/vim-airline/' content from commit 7a1801e

git-subtree-dir: .vim/bundle/vim-airline
git-subtree-split: 7a1801e9c456d0a043167003afc439543538ef3b
Merge commit '43b78042fb986307566cee667fa6ad77705fa066' as '.vim/bundle/vim-airline'
Revert "Merge commit 'c5903100d21b391d4d8fa1b354abfb1cd4d5ecff' as '.vim/bundle/vim-powerline'"

Remove powerline in favor of using airline

This reverts commit 5339a681a404764a9aea8364a2f015ae4edf0ad8, reversing
changes made to 799f0a57623da3658c061ead6f21108ba1faed8f.
Squashed '.vim/bundle/vim-fugitive/' changes from 3b5f715..546a6bf

546a6bf Focus diff window on :Gdiff
1b0ddad Reopen diff folds when diff ends
07c078c Add & modify autocmd events `FugitiveBoot` & `Fugitive`
6b338bd Fix slowness when searching for networked git repos under Cygwin.
34e2d25 Work around new status style in 1.8.5
dc250fc Add ability to query current Git version
050b22e Fix unmatched parens in :Gmove
ea18a6a Don't set global foldlevel
61fac2f Fix write to index with msysgit bash
124550c Change if block to correct ending
00b0916 Fix :Gmove command on Windows
f096152 Support angle quotes in git status

git-subtree-dir: .vim/bundle/vim-fugitive
git-subtree-split: 546a6bf2197529ed1bd402244cbf6e72ed62b2ca
Update vim plugin tpope/vim-fugitive to '821124180fa1e19aa319d3b258277475f42a9aff'
Squashed '.vim/bundle/vim-bufferline/' content from commit 1788138

git-subtree-dir: .vim/bundle/vim-bufferline
git-subtree-split: 17881383a670e9383a0cdc0fedf2107b2416ec01
Merge commit '2705c0930d5729eecb0311c25cad2078ad5e1668' as '.vim/bundle/vim-bufferline'
Update vimrc and README for airline and bufferline vim plugins
Merge branch 'improved_airline'