Add ActuatorSet methods
Merge pull request #138 from javierhe/dev

Add ActuatorSet methods
Merge pull request #139 from mnjuhn/dev

Adding target actuators and feedback sensors to Object Factory.
Add createScenarioElement to Factory
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.