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
Add tests for the browsing contexts
Update codes as review suggestions

1. Change the document charset
2. Change the to xhtml
3. Remove help link
4. BackCompat test and etc

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Remove the doctype of xhtml
Tests for the window's frameElement attribute
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