Bunch of changes and new stuff - check the readme changelog for a list

git-svn-id: http://plugins.svn.wordpress.org/bp-group-hierarchy/trunk@763873 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix PHP error in bp_has_groups

git-svn-id: http://plugins.svn.wordpress.org/bp-group-hierarchy/trunk@763891 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved error when activating plugin with BP groups component disabled; fixed JS bug

git-svn-id: http://plugins.svn.wordpress.org/bp-group-hierarchy/trunk@765238 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved compatibility with multisite installs

git-svn-id: http://plugins.svn.wordpress.org/bp-group-hierarchy/trunk@772757 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merging updates from SVN; fixing bogus readme from last merge