W3C Telephony API implementation.

Implements the latest W3C Telephony API specification found at http://telephony.sysapps.org/
Requires the oFono telephony middleware and the BlueZ Bluetooth middleware for working with paired phones.

BUG=XWALK-1419
> +Install necessary packages:
+zypper in bluez-test ofono-test tizen-extensions-crosswalk-examples
+
+Also, install helpers:
+zypper in glibc-devel glibc-devel-utils linux-glibc-devel gdb findutils-locate
+
+Set up environment (and proxy):
+export XDG_RUNTIME_DIR=/run/user/`id -u`