[Bluetooth] Use new C++ wrapper in common/extension.h

ExtensionAdapater should be deperacated by common::Extension and
common::Instance.
Merge pull request #322 from halton/bluetooth_refac

[Bluetooth] Use new C++ wrapper in common/extension.h
[Packaging] Use ninja instead of make.

There have been Ninja packages for Tizen for a while, so we can safely
switch to it just like Crosswalk did months ago.
Merge pull request #328 from rakuco/use-ninja

[Packaging] Use ninja instead of make.
Bump version to 0.64
[Cpplint] Re-enable style checker for download and fix some errors.
Merge pull request #329 from halton/cpplint

[Cpplint] Re-enable style checker for download and fix some errors.
[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