Caskfile: Move `phinze/cask` to `caskroom/cask`
Caskfile: Move `phinze/cask` to `caskroom/cask`

Homebrew Cask has been moved to https://github.com/caskroom/homebrew-cask.

Closes #375.

troyxmccall/dotfiles,troyxmccall/dotfiles,troyxmccall/dotfiles