update group management
use new group api as backend for the old api
cant use private members from closure in php <5.4
more consitency in hook names
add test case for getting group after deleting it
search parameter is not optional
consistent naming
more consistent naming
reneme id to gid
group: only pass backends that hold that specific group to the group constructor
Merge branch 'master' into groups
Merge branch 'master' into groups
Merge pull request #3995 from owncloud/groups

Refactoring of group management code