Responders in subpackage

[dgrijalva]

Scott, I think you're right that we should move most of the responders to a subpackage. I propose we keep SimpleResponse, StringResponse, ByteResponse, and PipeResponse in falcore proper and move all others to a new package, responder.

Thoughts?

[smw1218]

Sounds like a reasonable plan. The amount of code and docs for those responses is minimal so we can leave them where they are (or will be in the case of this repo)

[dgrijalva]

I looked into adding template responders. Template is crazy complicated, though. I think users are better of using a PipeWriter and just doing the template stuff. I wonder what other responders we could include without overstepping. Maybe some built in error ones?

[smw1218]

Some simple error ones might be nice but I think most would just be simple 1-liners around StringResponse (with empty bodies). But it seems like a lot of the other "frameworks" provide such things so I guess we could too.