Squashed 'bundle/dart-vim-plugin/' content from commit 58984d5

git-subtree-dir: bundle/dart-vim-plugin
git-subtree-split: 58984d50c69cefa52558e78247b23a5de2c008f9
Merge commit '949683517ad334190dc5a7f73601575a91427598' as 'bundle/dart-vim-plugin'