Merge branch 'release/2.0.0-milestone-8' into develop
version bump for develop
PROBCORE-247 cleaned up history
PROBCORE-202 An event is now sent when a history is closed. (Also improved Javadoc PROBCORE-242)
PROBCORE-242 working on Javadoc
PROBCORE-242 working on javadoc
removed unused interface + shifted control service classes to parent
folder
fixed register control images
activate a visualization view after opening a visualization
removed some unused interfaces
PROBCORE-248 Fixed Null Pointer Exception in UI Code
Merge remote-tracking branch 'origin/develop' into develop
PROBCORE-249 Commented out button for restart animation because we do not yet  know how exactly (or if) we should implement the command
towards implementing observer
Merge branch 'develop' of github.com:bendisposto/prob2 into develop
Fixes PROBCORE-251
created first attempt at StatisticsView PROBCORE-250
accept strings
PROBCORE-242
PROBCORE-252 CSPModel now has subclass AbstractModel. Type of Model in StateSpace and History is now also AbstractModel.