Migrating WebRTC 1.0 Editor's draft to github

Hi all!

To make it easier to track changes to editors drafts and for WG
participants to contribute, the editors team and chairs
have decided to officially migrate the WebRTC 1.0 draft a to Github
repository under the W3C organizational account:

- repo: https://github.com/w3c/webrtc-pc/
- draft: http://w3c.github.io/webrtc-pc/webrtc.html

(Note that the stats document is already at github as announced in [1])

Contributions (for things that have been discussed on the list, or are 
of editorial nature - don't make a pull request for a functional change 
that hasn't been discussed) are expected as pull requests on the
master branch; editors will proceed with dated releases as they have
been doing so far, using the gh-pages branch (which results in updating
the github.io URL above).

Redirects from the previous editor’s drafts URLs on dev.w3.org and
dvcs.w3.org URLs have been set up; the Github repository that Cullen has
been hosting for the webrtc spec is now deprecated.

Issues will still be tracked on the W3C's bugzilla instance; we may be 
switch to github issues at a later occasion.

Stefan & Harald

[1] http://lists.w3.org/Archives/Public/public-webrtc/2014Sep/0067.html