Remote scene controller support

[Poundex]

No description provided.

[coveralls]

Coverage increased (+0.3%) to 63.32% when pulling cfc124d on Poundex:topic/scene-controller into 5479490 on whizzosoftware:master.

[whizzosoftware]

Thank you for submitting these changes. A couple of comments/questions:

1. According to the Z-Wave Device Class Specification (if I'm reading things correctly), a Portable Scene Controller devices has the following mandatory command classes in addition to the ones you've already included: "Association", "Scene Controller Configuration", "Manufacturer Specific" and "Scene Activation". Ideally, those should be added to the constructor (except for perhaps Association because that is not yet supported anywhere). Otherwise, some TODO comments in the code would be helpful to indicate that the command class is not yet fully implemented.

2. Are the "Central Scene" and "Battery" command classes implemented by all Portable Scene Controllers? If not, they shouldn't be added in the constructor of Portable Scene Controller or it could cause problems with portable scene controller devices that don't implement those command classes. They should only be included if the device interview indicates they are implemented by the device.

3. According to the Z-Wave Application Command Class Specification, the "Central Scene" command class has 3 different versions. Which one(s) specifically are you trying to support with this new code? The implementation needs to be explicit about the maximum supported version number and implement all relevant version behavior or it can cause problems with certain portable scene controller devices.