Aiohttp

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- Make ProxyConnector.proxy immutable property.
- Make UnixConnector.path immutable property.
- Fix resource leak for aiohttp.request() with implicit connector.
- Rename Connector's reuse_timeout to keepalive_timeout.



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- Use case insensitive multidict for server request/response headers.
- MultiDict.getall() accepts default value.
- Catch server ConnectionError.
- Accept MultiDict (and derived) instances in aiohttp.request header argument.
- Proxy 'CONNECT' support.



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- Add support for utf-8 values in HTTP headers
- Allow to use custom response class instead of HttpResponse
- Use MultiDict for client request headers
- Use MultiDict for server request/response headers
- Store response headers in ClientResponse.headers attribute
- Get rid of timeout parameter in aiohttp.client API
- Exceptions refactoring



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- Simple HTTP proxy support.



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- Get rid of `__del__` methods
- Use ResourceWarning instead of logging warning record.



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- Do not unquote client request urls.
- Allow multiple waiters on transport drain.
- Do not return client connection to pool in case of exceptions.
- Rename SocketConnector to TCPConnector and UnixSocketConnector to
UnixConnector.



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