Sinatra::RespondWith providing mime_type and Accept header

[zzak]

This ticket is copied from sinatra/sinatra-contrib#149

[JonMidhir]

Have investigated this and I can only reproduce one of the two bugs now.

• When passing the header application/rss+xml the /comics/:name/feed route will indeed 404.

• When visiting /comics/:name/rss10 it's possible the 406 was actually a template engine error and fixed by this commit: de8ebed. Now it will 500 instead :)

I can take this and work on a fix if it's still useful. I guess there are two ways to go about it though, mime_type could take additional options for version etc. Or these can simply be parsed out of the string later.

[zzak]

@johnvoloski So we can close this ticket? 😬