Change comparison in getPositionOfItem in UserVariableAdapter

After copy ''item'' would be a different object. As we only want to know
the position of ''item'' in the adapter a comparison of the names is
sufficient.
Fix selection of ChangeVariableBrick's Spinner after copying a Sprite
Fix testUserVariableSelectionAfterCopySprite
change some strings in formula editor
FE: further string adaptions
new default project, fixes #364
Merge pull request #457 from Catrobat/issue#364_rebased

new default project, fixes #364
testrun after improvments: http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-no-emma-test/25/
changed pocket paint links/packages and new version
Merge pull request #465 from Catrobat/CopySpritesObjectVariables

Copy sprites object variables
accepted by @sjaindl, @robertpainsi and @felly
Merge pull request #467 from Catrobat/changeFEStrings

change some strings in formula editor
Merge pull request #469 from Catrobat/pocketpaint_link

changed pocket paint links/packages and new version
compile error fix accepted by Stephan and Stefan
first steps section added
Merge pull request #470 from Catrobat/firstStepsReadme

first steps section added
Merge remote-tracking branch 'origin/master' into tutorial_playground