fixed weird bug in PHP <5.3. fixes #74
fixes #76
Merge remote-tracking branch 'origin/master' into devel
Add IN operator and %groups% placeholder
%groups% is almost only useful with the IN operator.
Mark tests skipped, when translation plugin not installed
improve group placeholder and added a test
Add some filter tests
Merge remote-tracking branch 'origin/master' into devel
improve function headers
Merge pull request #86 from splitbrain/devel

IN operator and %groups% placeholder