Make enable to launch AgitFile from directory other than repository root
Merge pull request #20 from wonderful-panda/fix/agitfile-failure-from-curdir

Make enable to launch AgitFile from directory other than repository root
Remove trailing spaces
Fix: agit-stat does not work with latest Git (v2.2.0)
Catch only Agit's exception
Update test
Fix: :Agit with empty buffer causes "File not found" error. (#13)
Add noswapfile option for each views (related: #16)