First release for Elgg 1.9

• changes for Elgg 1.9
• added: group tool presets
• added: grouppicker autocomplete
• added: filter to group activity page
• added: option for group admins to export the members to CSV (admin enabled option)
• added: support for widget_manager group tool based widgets
• added: user menu items in group member listing
• fixed: PHP fatal exceptions when using group admins on group join
• fixed: problem with some tabs shown when logged out
• fixed: adding pagination to prevent long loading times with large lists #71
• fixed: hide my status join link depending on cleanup setting #60
• fixed: group visibility options in walled garden
• fixed: problem with some tabs shown when logged out
• changed: more efficient annotation query for email invitations (thanks to @beck24)
• changed: improved group thumbnail loading