Implemented Bluetooth Low Energy: examples

Examples which illustrate how to use BLE API are implemented. First example
is an application for discovering LE devices, services and characteristics.

Change-Id: Ic144c78499b74934541837df9a53183b4e7e32f7
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>