Bump version to 0.70
[AudioSystem][IVI]: Implementation of Tizen Audio System/Control API.

This commit implements proposed Tizen System Volume API on xwalk:
  https://wiki.tizen.org/wiki/User:Tanuk/AudioSystemAPI
This commit also includes a demo application that demonstrates the
usage of the api.

This enables to write volume control/settings/mixer type of web applications
using xwalk.

BUG=XWALK-1330
Merge pull request #325 from avalluri/audiosystem

[AudioSystem][IVI]: Implementation of Tizen Audio System/Control API.
Bump version to 0.71
[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.