background fix for SearchStoreViewController + removed unused code + fix for bug in ComeToFrontBrick-test

problem still remains: ComeToFrontBrick-test does not execute runAction correctly

Signed-off-by: Ralph Samer <ralph.samer@student.tugraz.at>
Merge branch 'spritekit' of gh:Catrobat/Catty into ide_tests

* 'spritekit' of gh:Catrobat/Catty:
  modifications for loading more programs from the server with offset