Micro-optimization for RodaResponse#finish
Micro-optimization for RodaResponse#finish

Idea to check for 304 then 204 first as they are the most common
from TiagoCardoso1983.  This also only calls body.empty? once
instead of twice.

jeremyevans/roda,jeremyevans/roda,celsworth/roda,jeremyevans/roda,celsworth/roda,celsworth/roda