Proposed fix of #405
Refactoring + Introduction of API 9 call of getRotationMatrixFrom Vector()
Update of SensorTest
Import update
Merge pull request #523 from Catrobat/issue#405

Y-inclination sensor value computation update

[Catroid-single-jUnit-test of SensorTest](http://jenkins.catrob.at/view/Catroid/job/Catroid-single-jUnit-test/94/console)
Merge branch 'master' into releaseMergeRequest