fix compilation problem
Merge remote-tracking branch 'sotty/master'
DROOLS-331 PropagationContext getting lost
-Tuple parent chains are not preserved. Instead the iterator skips null handles.
[DROOLS-327] check no-loop on terminal node instead of rule
DROOLS-332 Space Invaders and Number Guess Game
-Added two two new games
DROOLS-331 PropagationContext getting lost
-PCTX is now correctly set, but only inside of the modifies @PR intersect.
[DROOLS-64] Trait Performance and fixes