Move WebRTC tests to github

This is spawned from #240 which André pointed is a bit messy and there is too much going on in one commit.

So this is the first pull request where I basically only copy the files and make them run on github.
Another pull request will be made were the remainder of the original pull request #240 will be done in several commits.

* Copied all the manual test pages from the webrtc/test/manual folder in the WebRTC repo (svn r7738).
* Fixed license and DOCTYPE
* Fixed adapter.js path
* Fixed iframe-video iframe path