Aiohttp

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- Publish TCPConnector properties: verify_ssl, family, resolve, resolved_hosts.

- Don't parse message body for HEAD responses.

- Refactor client response decoding.

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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.