A number of changes relasted to groups, added datepicker to add matches form, fixed stdClass error on adding matches.

git-svn-id: https://plugins.svn.wordpress.org/leaguemanager/trunk@875361 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated trunk readme to 3.8.8.2

git-svn-id: https://plugins.svn.wordpress.org/leaguemanager/trunk@875362 b8457f37-d9ea-0310-8a92-e5e31aec5664