SensorCompatibility in iOS now detects the user's device brand, generation, and sku.  Based
on this system call, it utilizes a dispatch table to find what sensors are available to record
and returns them.  There's a thing called "NONSENSE" that is returned if it cannot parse the
system-call string handed back, indicating you're either on a simulator or newer device.
Minor copy/paste errors in dispatch code in iOS SensorCompatability
Merge pull request #575 from stowellm/ms572

SensorCompatability correctly identifies user's device