Disable TLS compression for Python 3.2+
Disable TLS compression in pyopenssl contrib module
Set preferred ciphersuites in pyopenssl contrib module
Move default SSL cipher list to root constant
Docs
Merge pull request #309 from dbrgn/disable_tls_compression

Disable TLS compression (CRIME)
CHANGES for #309
Account retries on ProxyError

Current implementation fails if it encounters a proxy error no
matter how many retries left.

Change the behaviour to try connecting until retry limit has reached
and then throw an appropriate exception: ProxyError or MaxRetryError.