Removed athost tests
reflect latest changes in getusermedia on mapping to media element
updated links back to spec

Conflicts:
	mediacapture-streams/mediastreams-as-media-elements/video-assignment.html
import from https://code.google.com/p/chromium/codesearch#chromium/src/third_party/webrtc/test/w3c/peerconnection_conformance_test.html
minor cleanup
file rename
remove webkit-isms
adapted RTCPeerConnection constructor to latest version of spec
added missing testharnessreport.js
one more webkit-ism
test for the output element
Even test on details element
Test the steps for pausing a media element when removing from a document
Combine all canPlayType tests into a single test framework

There is much more of canPlayType to be tested in later commits.
Add the missing types and codecs used in spec examples
Add the Opus codec, supported by at least Gecko and Chromium
Test that bogus codecs are not supported

Chrome and Safari fail this assertion.
test on dirname attribute
ref test for wbr
use Ahem font to force the rendering