Renamed StartMessage(name) to WriteMessageStart(name) on XmlFormatWriter as this
was intended to be an overload that did not get renamed.

Added unit tests for mime-type services extension.

Updated release notes to include details about previous and pending releases.

url-encoded form data to support restful apis.  Also exposed the mime to reader
and mime to writer via dictionaries in the MessageFormatOptions structure.

in ReSharper.