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
Merge branch 'master' into replaceHttp

Conflicts:
	catroidUiTest/src/org/catrobat/catroid/uitest/web/ProjectUpAndDownloadTest.java
rename a method
minor fix
Merge branch 'master' into replaceHttp
Merge branch 'master' into replaceHttp
Merge pull request #407 from Catrobat/replaceHttp

Replace http