Add Atom default config to installer

Not done yet. I'm trying to edit setup.py to automatically discover all the files in share and add them to MANIFEST.in, but having all sorts of weird errors.

UPDATE: Done!

This includes a default ~/.atom folder that has the metrics package disabled. The config is stored in a tarball in share/app/atom/atom-config.tar.gz and gets extracted to / to install it. So this fixes #32 (closed).

I've also implemeneted uninstalling atom, if you run sudo whiskers-cli atom uninstall, however the GUI part isn't implemented yet. So this partially does #30 (closed), but not all the way.