Replace http

Test are not running completely but when started separately. Seems to be an issue of the test suite.

full testrun:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/1118/
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/1151/ (latest merge with master)

single web test:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-package-test/121/
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-package-test/124/ (latest merge with master)