Add uninstall stanza for TotalSpaces
Added cask for SuperTuxKart

Refactored SuperTuxKart cask

- changed file name from super-tux-kart.rb to supertuxkart.rb
- changed class name from SuperTuxKart to Supertuxkart
- changed sourceforge url to point directly to actual Mac app
Updated PCKeyboardHack from v10.6.0 to v10.7.0
Merge pull request #4744 from poltak/supertuxkart

Added cask for SuperTuxKart
Merge pull request #4797 from poltak/pckeyboardhack

Updated PCKeyboardHack from v10.6.0 to v10.7.0
Merge pull request #4794 from alebcay/totalspaces

Add uninstall stanza for TotalSpaces