aiohttp 0.14 release

0.14 is the great release.

We have finished a hard work to stabilize aiohttp.web now.

Almost any new wish appeared in our mind may be implemented with the current code by third-party libraries: CORS, sessions, authorization, rendering and so on without the need for making changes in aiohttp itself.

That's a very strong sign on aiohttp.web design: the library is good and it is as tiny as possible.

0.14.0 (15/01/2014)

• HttpMessage._add_default_headers does not overwrite existing headers #216
• Expose multidict classes at package level
• add aiohttp.web.WebSocketResponse
• According to RFC 6455 websocket subprotocol preference order is
  provided by client, not by server
• websocket's ping and pong accept optional message parameter
• multidict views do not accept getall parameter anymore, it
  returns the full body anyway.
• multidicts have optional Cython optimization, cythonized version of multidicts is
  about 5 times faster than pure Python.
• multidict.getall() returns list, not tuple.
• Backward imcompatible change: now there are two mutable multidicts
  (MultiDict, CIMultiDict) and two immutable multidict proxies
  (MultiDictProxy and CIMultiDictProxy). Previous edition of
  multidicts was not a part of public API BTW.
• Router refactoring to push Not Allowed and Not Found in middleware processing
• Convert ConnectionError to aiohttp.DisconnectedError and don't
  eat ConnectionError exceptions from web handlers.
• Remove hop headers from Response class, wsgi response still uses hop headers.
• Allow to send raw chunked encoded response.
• Allow to encode output bytes stream into chunked encoding.
• Allow to compress output bytes stream with deflate encoding.
• Server has 75 seconds keepalive timeout now, was non-keepalive by default.
• Application doesn't accept **kwargs anymore (#243).
• Request is inherited from dict now for making per-request storage to
  middlewares (#242).