Add UiTests for UserVariable modification on stage bug and UserVariable add after stage bug
Quickfix: UserVariableAdapter initialization in showFragment.
testModifyUserVariableValuesInStage extended
Quickfix for modify userVariables in stage and keep values afterwards
Fix jenkins null pointer when accessing final Double field
Merge remote-tracking branch 'origin/master' into UserVariables
Change Sprite-String to reference in UserVariablesContainer, Remove warnings
Merge branch 'master' into XMLChanges
refactor xstream aliases

* spriteList -> objectList
* userVariables -> variables (container for variable lists)
* projectVariables -> programVariableList
* spriteVariables -> objectVariableList
xstream alias refactoring

* change in naming of members; sprite->object (for references)
* pointedSprite -> pointedObject
increase catrobatLanguageVersion to 0.6
add xmlheader entry for tags
Delete not used variables
Merge pull request #204 from Catrobat/XMLChanges

xml version 0.6
merge with master
Merge pull request #195 from Catrobat/UserVariables

User variables - quick bug fixes
Remove merge artifact
Merge branch 'master' into ChangeCategoriesDialogToFragment