Add explicit support for consumes and produces parameters in spec

Enable consumes to modify content-type sent by swagger-UI.

Enable produces to be sent to swagger-UI. As of this commit swagger-UI doesn't seem to do much with the parameter, however it is described in the 1.2 spec.

I've made these explicitly included to ensure that these parameters are passed, even if something changes in the custom parameter setters (starting line 541).
Merge pull request #57 from kyriesent/consumes_produces

Add explicit support for consumes and produces parameters in spec