major pull - remove old motion probe, add CoreMotion probes, support m7, app backgrounding

- removes old accelerometer/magnetometer/gyro probes
- replaces with CoreMotion probes, which fire in sync
- adds m7 probes (still untested. They test to make sure that the phone has an m7 chip).
- background processing and wakeup every ~8-30 minutes. This  annoyingly sends a notification. This is for testing purposes and will be cut out before integration.
- simplify [probe name]
- additional readme info

(sorry for the other pull requests. I was mistakenly trying to pull from my repo. Hopefully this one works...)

- Al