correct picking order
spec conform background drawing
(use setOpaque(false) for nice effects)
timing for no animation
started non-layouted group members
correct order of interaction
double dispose bugfix
combinind composites
intuitive behaviour for animations with no duration
animated objects
improved linear layout
better java-doc for quadratic matrix
removed leaky auto refreshing
do not allow list changes during layout
a better way to detect changes would be to use an iterator instance and wait for concurrent modification exceptions (idea by Leonard Wörteler)
more options to work with non-layouted render-passes
Merge remote-tracking branch 'joschi/group'

Conflicts:
	src/main/java/jkanvas/groups/RenderGroup.java
automatic detection of animatable objects
return screenshot file
correct indentation
default realizer for node-link diagrams
Merge remote branch 'joschi/animate'