handle mining.set_extranonce method
subscribe for mining.extranonce
Allow disable extranonce subscribe
Send subscribe request before auth
Change mining.set_extranonce method as stratum notification
Set extranonce.subscribe timeout to 2sec
Some tweaks for extranonce
Handle pool response, who send errors in invalid format
Move no-extranonce-subscribe parameter to a pool config
Merge pull request #17 from bitbandi/nicehash-extranonce

Nicehash extranonce