Replace tokens after each upload

Token is replaced after each upload for security purposes.
+ Change Catroid Links to Pocket Code (Issue #303)

Testruns:
Web package:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-package-test/81

JUnit + Source Tests:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test-source-and-jUnit-tests-only/60

failed test:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/584