Fixed Bug #49 - PHP Notice when user accepts invite though the Invite Anyone Plugin.

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@760169 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed Bug #48 - Disabling specific comment hook instances with zero does not work

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@760171 b8457f37-d9ea-0310-8a92-e5e31aec5664