reset globals
fixed backwards coordinates
fixed
get username of glass user
Merge branch 'master' of https://github.com/hwray/Dais

Conflicts:
	AndroidManifest.xml
	src/com/stanford/dais/PrepPresentationActivity.java
First draft of decibel-detection code, imported from GDK Waveform example.
Refactored mGazeThread into a private runnable class, rather than a generic Thread.
Removed demo headings array from Presentation object.
Added mPrefVolume var to Presentation object, which will store the desired speech level of the presenter in decibels (will be calibrated before the presentation, like the left and right side of room markers).
Added SpeechCalibrationThread to PrepPresentationActivity.
SpeechCalibrationThread now correctly computes and displays average/desired decibel level of presentation from 8-10 second calibration phase.
Ignoring touch events during calibration phase, and presenting user with Calibration Complete feedback, and allowing them to tap to begin presentation instead of starting right away.
Bugfix for speech level calibration.
Added mFloorVolume variable to Presentation object, and added code outline for providing Speak Up feedback when presenter starts to mumble
Added background noise calibration step.
Recording of average background room noise level now working.
Added decibels array to Presentation object, which stores all deibel readings from the mic during the course of the presentation.
Added liveFeedbackMode boolean check to PresentationActivity.
Completed integration of No Feedback mode for comparative user testing.
add images for directional cues