Remove unnecessary code
Update README (Related: #12)
Fix PlugStatus/PlugClean on Windows
Replace shellescape function to avoid error when &shellslash is set
Merge pull request #13 from junegunn/shellesc

Replace shellescape function to avoid error when &shellslash is set
Support paths with spaces (#15 [, #14])
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md
	plug.vim