Merge pull request #140 from javierhe/dev

Add createScenarioElement to Factory
Adding actuator set getters and setters to scenario top level object.
Merge branch 'dev' of github.com:calpath/model-objects into dev
Removing duplicate method in Scenario Model Object.
Merge pull request #141 from mnjuhn/dev

Updated Scenario object with actuator id methods.
Merge pull request #142 from javierhe/dev

Add method to query actuator by originalID
Adding some helper methods to Scenario and Actuator MO.
Taking out drools dependency for now (put it into validation branch).
Merge pull request #143 from mnjuhn/dev

Dev
Fixing scenario get set id methods to get id of sets based on sub objects if helper id variables are not set.
Merge pull request #144 from mnjuhn/dev

Fixing scenario get set id methods to get id of sets based on sub object...
Add methods to work with array sublists in Demand and SplitRatio