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

[RogerTangos]

• 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

[h0pbeat]

Thanks. Could you do smaller but more frequent pull requests, it would be easier for me to review?