added basic support for finagle cookies on RequestReaders and Responses
updated to reuse OptionalCookie and change withCookie to withCookies
Merge pull request #125 from rpless/cookies

Basic Finagle Cookie support
Removes son package from core and adds universal Decode/Encode #124
Merge pull request #127 from pasviegas/universal-encodedecode

Removes son package from core and adds universal Decode/Encode #124