Squashed 'bundle/unite-quickfix/' content from commit 3e695c5

git-subtree-dir: bundle/unite-quickfix
git-subtree-split: 3e695c5cc6525e16ae3d26fb2e7d8e7753ed0760
Merge commit '526c0c66cc87c74bee9571914964f3430f2aa34b' as 'bundle/unite-quickfix'