[MediaRenderer] Fix issues with Mute and Volume apis.

Refactored and fixed issues in Mute and Volume APIs and added
dbus code for reading arrays.
Bump version to 0.95
Merge pull request #372 from sragavan/master

[MediaRenderer] Fix issues with Mute and Volume apis.
run examples and demos with xwalk-launcher

As /usr/bin/xwalk binary doesn't exist anymore, we can not launch
examples and demos from xwalk binary.

In addition, this patch removes tizen-extensions-crosswalk script file
which appears to be useless right now.

BUG=XWALK-2370