Parameters & accelerometer

This branch adds support for reading two new kinds of data from the copter.

If your copter is a 10DOF with firmware that supports the accelerometer on that build, you can do something with the 'accelerometer' events from the telemetry module. `copter.js` has a handler that does nothing but log.

Also, implemented basic support for reading copter parameters, that is, settings from the device. I have not yet tested setting parameters, though that might work. 

Bumped version in preparation for a fresh push to npm.