Resolved bug when read empty shared preferences.

Added functions in DataStore.java for create and edit beacons table in database, but didn't make application to use it.

Added in PlayVideo.java mediaPlayer.reset command before set data, it is recommendation by documentation.

Added in PlayVideo.java mediaPlayer.setVideoScaling, to video to play to looks nautural.

In StoreBLEDevice.java added all conscrutor for who knows..