[giow] (0) Completely revamp how peer-to-peer networking works (and s…

…ome minor typo fixes in other parts of the spec). This is only a second draft, and therefore this feature will likely evolve a lot over the coming months. Detailed responses to feedback on the topic will be sent out soon.

git-svn-id: http://svn.whatwg.org/webapps@5945 340c8d12-0b0e-0410-8428-c7bf67bfef74