Fixes README for opening vim with no files
Merge pull request #347 from kelaban/minor-fix-to-readme

Fixes README for opening vim with no files
Merge branch 'master' of github.com:scrooloose/nerdtree into develop

* 'master' of github.com:scrooloose/nerdtree:
  Fixes README for opening vim with no files

Conflicts:
	README.markdown