spritedialog & projectsactivity tests refactored

combined similar tests to accelerate testing
Moved redundant test from ProjectActivityTest to NewSpriteDialogTest
comment corrected
removed ErrorListenerInterface
changed ProjectManager, Utils: showErrorDialog method added
more refactoring
remaining dialogs refactored
removed Utils.displayErrorMessageFragment
refactored Fragments
MainMenuActivity refactored
refactored Activities
CatroidTest refactored
refactored UItests
Merge pull request #172 from Catrobat/refactorErrorListener

Refactor error listener
Merge pull request #166 from Catrobat/UITestRefactoring

Ui test refactoring
Merge branch 'master' of ssh://github.com/Catrobat/Catroid into xstream_testing

Conflicts:
	catroidTest/src/org/catrobat/catroid/test/io/MediaPathTest.java
change loadProject parameter call in test
add TODO markers for XML validation