Added QR(callback) functionality (#59) to API.

Use the WS.QR(callback) to get the Base64 encoded data from the QR code, along with a format mode from the barcode scanner.

Conflicts:
	glass/WearScript/build/apk/WearScript-debug-unaligned.apk
Changed to WS.qr and added docs

Signed-off-by: Brandyn A. White <bwhite@dappervision.com>