New Features

HTTP/1.1 support! See the documentation for more. (Issue #75)
Implementation of a HTTPHeaderMap data structure that provides dictionary style lookups while retaining all the semantic information of HTTP headers.

Major Changes

Various changes in the HTTP/2 APIs:
- The getheader, getheaders, gettrailer, and gettrailers methods on the response object have been removed, replaced instead with simple .headers and .trailers properties that contain HTTPHeaderMap structures.
- Headers and trailers are now bytestrings, rather than unicode strings.
- An iter_chunked() method was added to response objects that allows iterating over data in units of individual data frames.
- Changed the name of getresponse() to get_response(), because getresponse() was a terrible name forced upon me by httplib.