Make implementing Binder optional

[ribice]

Sometimes I don't need to validate anything in request.

Would you consider a PR where render.Bind accepts r *http.Request, v interface{}, and if v implements Bind() method only then execute it?

[fr3fou]

I was wondering the same thing! What did you end up doing?

[ribice]

I'm using gorilla for all my APIs and have this method written on my own.