Simple toString on Request and Response.
Merge pull request #756 from square/jw/request-to-string

Simple toString on Request and Response.
Making a few classes/interfaces within SPDY public so that the framing
layer can be used for non-HTTP traffic.
Merge pull request #759 from nmittler/master

Making a few classes/interfaces within SPDY public
Close the source after reading regardless of result.
Merge pull request #758 from square/jw/close-on-exhaust

Close the source after reading regardless of result.
Add MockWebServerRule.