Update IntentIntegrator.java
Added overload: open(cameraId)
Added constant Intents.Scan.CAMERA_ID
Added setManualCameraId() and amended openDriver()
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Amended onResume() to read CAMERA_ID from intent
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+ comments, >=0
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Refactored open() into one method
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Merge pull request #135 from slepmog/master

Adding ability to select camera when integrating via intent