Refactor response methods in ProxyConnection
Refactor response methods in ProxyConnection

- Make response methods private.
- Rename #stub_request to #respond_from_stub
- Refactor actual response code to new #send_response method.

maukoquiroga/puffing-billy,aliada-mx/puffing-billy,oesmith/puffing-billy,springleaf/puffing-billy,Jack12816/puffing-billy,thinkthroughmath/puffing-billy,eliotsykes/puffing-billy,maukoquiroga/puffing-billy,skyhaikuteam/puffing-billy,eliotsykes/puffing-billy,destinf/puffing-billy