Added previous calibration page to the new AndroidApp2
Merge branch 'bt2' of https://github.com/jtrovato/starfish-avocado into bt2

Conflicts:
	android_app2/src/edu/upenn/seas/senior_design/p2d2/HomeActivity.java
removed references to BTthread from HomeActivity and CalibrateActivity, did not make major logic changes.
Changed CalibrateActivity methods use BTConnectionService
Added write to bluetooth methods for different testing buttons, removed valve test.