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)
Respect original settings on catfile buffer

leave these settings unchanged on catfile buffer
  number/relativenumber/wrap/cursorline/cursorcolumn
Show diff on AgitFile tab