[Alarm]: Implementation of Tizen alarm API.
This commit implements the Alarm API:
  https://developer.tizen.org/dev-guide/2.2.0/org.tizen.web.device.apireference/tizen/alarm.html

There is a known issue about repeat alarm: if the working system time zone is set to Daylight saving time like PDT or EDT, the repeat alarm finds 3600 seconds gap on the initial trigger time.

BUG=XWALK-428
Merge pull request #333 from yejingfu/topic-alarm

[Alarm]: Implementation of Tizen alarm API.
[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>