#206 GPS functionality

-GPS sensor support by LocationDetector class
-permission "ACCESS_FINE_LOCATION" is declared in manifest file for the location-service
-Recording, RecordingActivity, RecordingMetadataActivity are changed to support the location(latitude, longitude)
 So, when the recording button is pressed, the location-service is requested and the location data will be stored 
 in the metadata.
-Transcript is modified a little due to errors made by the comment checker.
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