rewriting http to https-connection
tests may fail because of lack of https-connection
change test-connection to https too
refactor tests and exception messages
changed http-connection to Kevin Sawicki`s http-request library
improvement of error handling
minor fixes
refactor up- and download tests, remove NullPointerException and lint error+warnings
refacter md5 test
Delete unused broadcast messages upon save project
Fix BroadcastBricksTest
Fix deleting of unused broadcast messages
Merge branch 'master' into DeleteBroadcastMessages
Fix test
Merge branch 'master' into DeleteBroadcastMessages
Merge branch 'master' into replaceHttp

Conflicts:
	catroidUiTest/src/org/catrobat/catroid/uitest/web/ProjectUpAndDownloadTest.java
rename a method
Merge branch 'master' into DeleteBroadcastMessages
minor fix
Merge branch 'master' into DeleteBroadcastMessages
Merge pull request #401 from Catrobat/DeleteBroadcastMessages

Delete broadcast messages