simple implementation of scroll view
only move if necessary
moveTread should ignore Pipette
add an IgnoreTools EnumSet
cosmetics
small change in testShouldMoveOnMoveEvent
scroll tolerance depends on screen metrics
crop tool behavior should be different
add a boolean to stop scrolling if necessary
stop scrolling if cropping box gets to small
scrolling view in BaseToolWithShape depends on tool position
Merge remote-tracking branch 'origin/master' into sg_scroll_view

Conflicts:
	Paintroid/src/org/catrobat/paintroid/tools/implementation/BaseToolWithRectangleShape.java
disable pinch during scroll
added test, refactor convert from to functions
add CropTool to IgnoreTools for moveThread
test added
test RectTool scroll in all directions
tests for scroll view added and improved
small changes to prevent assertion faults
scrolling speed depends on scale