added basic device orientation handling.
fixed remove event listener call, and corrected the boolean.
created device script, moved device motion logic from input to the device namespace.
renamed properties to match that of the browser API.
moved input event handlers and logic into device namespace. Added super basic example.
split up properties, and documented them separately. Added accelerometer to the simple test example
Merge pull request #281 from agmcleod/device-orientation

added a new `me.device` singleton object that will hold device capabilities/information and device specific event management (devicemotion, orientation)