Revert "Remove submodules"

This reverts commit 2355cb660e3df66ea569ff3a5469f5a200fd80c1.
Merge branch 'master' of github.com:wizcorp/phonegap-facebook-plugin
Merge branch 'master' of github.com:wizcorp/phonegap-facebook-plugin
Merge branch 'master' of github.com:wizcorp/phonegap-facebook-plugin