notification icon changed to black/white
unstable testcase in ProjectUpAndDownload fixed.
unstable testcase in MainMenuActivity fixed.
Merge pull request #1011 from Catrobat/cat-1049

testcase ProjectUpAndDownloadTest.testUploadStandardProject fixed
Merge pull request #1007 from Catrobat/cat-943

CAT-943
notification icon changed to black/white
Drone default project button animation on stage
Create drone project on startup
Refactor DroneBrickFactory brick generation
Merge takeoff and land sprites into one with changing look