[AudioSystem][IVI] Fix crash while destroying audiosystem extension object.

Missing NULL check added to pulseaudio context object in AudioSystemInstance
destructor. This allows clean shutdown of audiosystem extension process.

BUG=XWALK-1964
Merge pull request #334 from avalluri/audiosystem

[AudioSystem][IVI] Fix crash while destroying audiosystem extension obje...
Bump version to 0.72
[Bluetooth] Implement API based on Tizen bluetooth framework

Make 3 bluetooth extension backends : bluez4, bluez5 and tizen_capi

- add bluetooth_instance_capi.* source code using Tizen bluetooth C API
- remove Tizen C API calls from bluez4 backend
- fix bluez5 backend build
- modify device class major, minor and services JSON messages

BUG=XWALK-1065

Signed-off-by: Corentin Lecouvey <corentin.lecouvey@open.eurogiciel.org>
Merge pull request #308 from eurogiciel-oss/bluetoothAPI

Implement bluetooth API based on Tizen bluetooth stack
[Package_api] Skeleton code for Package API

Add package instance skeleton code
validate arguments
[WIP] Install / Uninstall skeleton code
Adding getters/setters
cstor + dtor(PackageManager create/ destroy)
[WIP] getPackages
WIP : refactor: add PkgMgr / PkgInfo class

Install/Unistall: done ; tests needed
WIP: GetPackagesInfo
Add some console logs