Fix blocking properties

[dpolivaev]

1. return blocksRequiredProperties || isBlockedBy(dependentRules);
2. TriggeredStatefulRule.propertyValueSet :

            if (getCondition().isSatisfied(engineState)) {
+               if(! blocksRequiredProperties)
+                   for(String trigger : getTriggeringProperties()){
+                       final Assignment assignment = engineState.getAssignment(trigger);
+                       final Rule rule = assignment.rule;
+                       if(rule.blocksRequiredProperties() && rule.valueHasChangedNow()) {
+                           setBlocksRequiredProperties(true);
+                           break;
+                       }
+                   }
                addValue(engineState);