emacs.rb: Update to version 24.3
Merge pull request #191 from eduardokasa/emacs24.3

emacs.rb: Update to version 24.3
Add Mumble cask
Add AppCleaner cask
Merge pull request #193 from mfilej/app-cleaner-2.1.0

Add AppCleaner cask
Merge pull request #192 from mfilej/mumble-1.2.3a

Add Mumble cask