vimrc update
vimrc: improve warning for css files with scss/sass present
Update submodule neobundle 18fe84c...57f97ef

* neobundle 18fe84c...57f97ef (4):
  > Merge pull request #306 from blueyed/git-use-pull-ff-ffonly
  > Improve documentation
  > Update documentation
  > Use tr() instead of substitute()