remove XML parser and add xstream-1.4.4
test cases in catroidTest not changed yet
Merge remote-tracking branch 'origin/master' into xstream_testing

Conflicts:
	catroid/src/org/catrobat/catroid/xml/parser/BrickParser.java
	catroid/src/org/catrobat/catroid/xml/parser/CatroidXMLConstants.java
	catroid/src/org/catrobat/catroid/xml/parser/FullParser.java
	catroid/src/org/catrobat/catroid/xml/serializer/BrickSerializer.java
	catroid/src/org/catrobat/catroid/xml/serializer/Serializer.java
	catroid/src/org/catrobat/catroid/xml/serializer/SoundSerializer.java
	catroid/src/org/catrobat/catroid/xml/serializer/SpriteSerializer.java
remove XML parser tests
remove unused aliases
change & remove XML related testcases
Merge branch 'master' of ssh://git@github.com/Catrobat/Catroid.git into xstream_testing
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
remove warning - unused String
refactor naming of variables
Merge pull request #173 from Catrobat/xstream_testing

Introduce XStream