Missing support for WebRTC

[Shimi Chen]

Midori currently does not support web conferencing (http://www.webrtc.org/).

Support can be tested on:
http://iswebrtcready.appear.in/
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about:version

Command line midori
Midori 0.5.10 ((null)) Midori
GTK+ 2.24.27 (2.24.28) Glib 2.44.0 (2.44.1)
WebKitGTK+ 2.4.8 (2.4.9) libSoup 2.50.0
cairo 1.14.2 (1.14.2) libnotify No
gcr 3.15.92 granite No
Platform X11; Linux x86_64
Identification Mozilla/5.0 (X11; Linux) AppleWebKit/538.15 (KHTML, like Gecko) Chrome/18.0.1025.133 Safari/538.15 Midori/0.5
Video Formats H264 [x] Ogg Theora [x] WebM [x]