Update instructions for TextMate2

Apparently the previous apple script no longer works, instead you TextMate needs to be opened for the bundle to be installed https://stackoverflow.com/questions/8930984/error-running-osascript-e-tell-app-textmate-to-reload-bundles

Someone also reported this error on 04573a0535a0b91ae0b214def673468e62958c66
Merge pull request #2 from casallas/patch-2

Update instructions for TextMate2