On Textmate 2 the bundles have moved. The same code supplied here seems to work fine without any modification.
New location ~/Library/Application Support/TextMate/Managed/Bundles
Installation (should be):
mkdir -p ~/Library/Application\ Support/TextMate/Managed/Bundles
cd ~/Library/Application\ Support/TextMate/Managed/Bundles
git clone git://github.com/leafo/moonscript-tmbundle.git MoonScript.tmbundle
On Textmate 2 the bundles have moved. The same code supplied here seems to work fine without any modification.
New location
~/Library/Application Support/TextMate/Managed/BundlesInstallation (should be):