Bluetooth LE sample.

This sample demonstrates how to communicate with a Generic Attribute Profile (GATT) server over
Bluetooth Low Energy.  This feature is available on Android 4.3 (API level 18) and above

You can test this sample app using any Bluetooth Low Energy-capable devices.  If the device
supports the Heart Rate Profile, the app will parse and display the heart rate.

Change-Id: I69a4955cb9929f837e81ad1c19145ff45bdd27ec
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