Script activity redesign

fixes #487 
Spinner removed from Script Activity.
+ minSDK set to 10 (as discussed).

Testruns:
http://jenkins.catrob.at/job/Catroid-single-UI-package-test/161/

org.catrobat.catroid.uitest.ui.fragment.LookFragmentTest.testShowAndHideDetails:
http://jenkins.catrob.at/job/Catroid-single-UI-test/982/

org.catrobat.catroid.uitest.ui.fragment.ScriptFragmentTest.testOptionsEnableLegoMindstormBricks:
http://jenkins.catrob.at/job/Catroid-single-UI-test/984/