Merge pull request #62 from EddieGarmon/xml-updates

Cleanup XmlContentTypeHandlerTests
Fixed web.config.transform
Merge branch 'master' of github.com:markrendle/Simple.Web
Merge pull request #65 from EddieGarmon/xml-updates

IMediaTypeHandler updates and IConvertXmlFor first pass
Merge pull request #66 from EddieGarmon/xml-updates

Media Type Converter updates - needs review
Made some changes for code review
All MediaTypeHandlers use the same model for testing.
merge code review updates
cleanup Task.Factory.StartNew per code review comments.
Xml performance demo