Delete some unnessecary import-statements and add me as author of some class

Same commit as 20a25441a10b85ca80ac48e813fab6531c086d63(Wed Jun 4 15:14:19 2014)
https://gitlab.informatik.uni-bremen.de/mobile-eresearch-and-big-data/app/commit/20a25441a10b85ca80ac48e813fab6531c086d63