Added UTs for the JwtAuthenticationMessageHandler
Added to gitignore, and modified readme.md to be consistent with the certmgr usage doc on msdn
Added logs subdir to gitignore, updated readme with testing info, fixed log configuration in web.config
Added the principal transformer
Returning ClaimsPrincipal from the IJwtSecurityTokenHandler, and using it in the transformer (type-safe)
updated md file
updating README and sample site with new IPrincipalTransformer
updating version