Added class detection and handler code for GriefPrevention v7.7's API.

The version has been updated to 1.0.1-SNAPSHOT.
Fixed the incorrect Strings used when looking for a class!

Also resolved an error that would occur upon disabling if a supported version was not found.
Made some small recommended changes.
Merge pull request #1 from dualspiral/7.7-eev

Add GP 7.7 compatability