homeshick compatibility

Merge with care. I have not been able to run your setup on my system, because it is quite different.
Tested with homeshick and using `export HOME=$HOME/Workspace/test-home` though.

I can recommend symlinking your entire `User` dir from sublime into e.g. `$HOME/homeshick/repos/ST3-Settings`. This way you can easily add new files for plugin configs to git.

(Fixes #4)