Stampbox partially or completely outside Drawingsurface now works as
supposed
StampToolIntegrationTest, start
more StampToolTest stuff
more test stuff
more teststuff
change in stampOutsideDrawingSurface
test corrected
fixed for 800 * 480
removed unused paint object
introduce some constants for better readablility
Merge pull request #49 from Catrobat/max_sandbox

8.24P Stamp image when box partly outside canvas
Implementation: @landliebe [ML]
Acceptance: @galstc05 [SG]