Release notes for release 0.13

New features:
- [xwalk extension] implements full W3C automotive BG vehicle and data APIs
- [OpenCV plugin] code updated to the new 3.0 beta API
- [OpenCV plugin] driver drowsiness detection test code
- [Bluemonkey plugin] support for zones in JS API.
- [Bluemonkey plugin] database module.

Changes:
- OpenCV plugin experimental options for cuda and kinect are removed
- Removed unmaintained plugins: tpms, websocket{sink,source}

Fixes:
- [DBus plugin] Fix exporting properties in zones that really don't have support
- [xwalk extension] fixed set() for some types did not work because of invalid GVariant creation.
- [websocket plugin] Updated html test page.  Fixed protocol usage.