stratum protocol extensions

[bonesoul]

• https://bitcointalk.org/?topic=557866
• https://bitcointalk.org/?topic=557991.msg6079772#msg6079772
• https://github.com/luke-jr/bfgminer/blob/dc9df6e34976e8b3c632ac0d45a63549f091bed7/driver-stratum.c
• http://bitcoin.stackexchange.com/questions/13169/protocols-for-use-between-mining-clients-and-mining-pool-servers

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[bonesoul]

• mining.hashes_done
• client.show_message
• https://github.com/slush0/stratum-mining-proxy/blob/master/mining_libs/client_service.py