Add Heart Rate Service sample for bluetoothLowEnergy
Fixed minor style issues
Moved UI related code into its own module.
Placed the sensor code into a module
Merge pull request #267 from armansito/ble-hr-sensor

Add Heart Rate Service sample for bluetoothLowEnergy
[camera-capture] Added poster image
Merge pull request #269 from armansito/ble-battery-service

Add Battery Service sample for bluetoothLowEnergy
Adding screenshots for bluetooth samples.