Squashed 'bundle/vim-session/' content from commit 6773a22

git-subtree-dir: bundle/vim-session
git-subtree-split: 6773a22dab67d55eded1fe4b40119a36d9b04f26
Merge commit '30223432ce6b1681d4d68cffa6b9161c53c79b67' as 'bundle/vim-session'