Choosy is only a OS X app

It should not be required to be run on Linux.
Add Beyond Compare application
Add Alfred application
Remove TODO as it is done

The TODO said to use the HEAD version of mackup.
Only restore should be run, not backup

When mackup is installed, almost nothing else has been installed
so there is no need for doing a mackup backup.
Only run restore if not ran already

If ~/.git is a symlink, the restore has alredy been ran.
Install newer git from Homebrew

Also fix the executable bits on the hooks.
Enable full keyboard access for all controls
Extract method for marker file
No need for both IntelliJ v13 and v14
First cut on ruby with chruby
Improve name of section (hacks --> config)
Fix world writable /usr/local/
Include HipChat application as dependency
Set Homebrew zsh as default shell