Squashed 'vim/vim.symlink/bundle/benmills-vimux/' content from commit 9a410c5

git-subtree-dir: vim/vim.symlink/bundle/benmills-vimux
git-subtree-split: 9a410c51582e73f7a47ca1e09dfe611c8eae9920
Merge commit '6c8af107805072b0fe4c600ec41ae04c532b3a7a' as 'vim/vim.symlink/bundle/benmills-vimux'
added vimux