Owin 1.0

Merged in latest from master (as of a few days ago, it's already out of date)

Implemented a few more request properties, and additionally implemented x-www-form-urlencoded form support. To support file transfers, multipart/form-data will need to be supported but I haven't implemented that yet (and might not, not sure yet - I don't have an immediate need for it and it looks more involved.)