v2.0.0-rc.8

Since rc.7 the following changes have been made:

• CCM is no longer part of the default cipher suites #201
• SNI extension support #194
• End to end tests with OpenSSL client/server #193
• Large refactor of the handshake using the state machine from RFC6347 Section 4.2.4 #208
• Fixes for a number of deadlocks
• Replay attack protection #215
• Verify the protocol version #211
• Fix the hash algorithm detection #224
• Close the connection on a sequence number overflow #214
• Concurrent read and accept #226
• Insecure hash algorithms are disabled by default #231