stream_encode_multipart handles bytes/str correctly
py3 tries to call _TestCookieHeaders.get_all, add it
EnvironBuilder accepts unicode data
@mitsuhiko, i am taking you at your word

http://www.bpaste.net/show/SG19eDNgMQcXTHhDMS0r/
Merge pull request #323 from untitaker/sprint-branch

@mitsuhiko, i am taking you at your word
Merge pull request #318 from puzzlet/sprint/test

Fixes to test.py