[init] Clean up `osx.sh`
[init] Clean up `osx.sh`

* Remove/Update settings that no longer work in Mac OS X Mavericks.
* Remove settings that were barely used in the past.

christophermoura/dotfiles,codelandev/init-setup,stevenirby/dotfiles-1,AlbertoElias/dotfiles,AlbertoElias/dotfiles,newtonne/dotfiles,christophermoura/dotfiles,khornberg/dotfiles,oddlord/dotfiles,sophatvathana/dotfiles,newtonne/dotfiles,zlot/dotfiles,wingy3181/dotfiles,makabde/dotfiles,pbrooks/dotfiles,b-boogaard/dotfiles,mickael83/ubuntu-dotfiles,girishramnani/dotfiles,mickael83/ubuntu-dotfiles,zlot/dotfiles,wingy3181/dotfiles,EDiLD/dotfiles,EDiLD/dotfiles,girishramnani/dotfiles,wingy3181/dotfiles,makabde/dotfiles