delete vim better whitespace
Squashed 'sources_non_forked/vim-better-whitespace/' content from commit fb5b0b8

git-subtree-dir: sources_non_forked/vim-better-whitespace
git-subtree-split: fb5b0b8e51a294f358615060b6e2b44b5ca0674e
Merge commit 'cd1d8279b217f4255313791af83a91683399ccc7' as 'sources_non_forked/vim-better-whitespace'