For #6 removed responseformat type as it was getting in the way and the content type is the only way to know what writer to use now. test's are failing, about to replace ODataWriterFactory with ODataWriterRegistry
Switched TargetKind to an Enum
Moved mime types out of constants and into their own file
For #6 base tests for getResponseContentType, skipping complicated stuff
For #6 till ODataWriterFactory is ported, doing this