1、公开ISnowWorker、SnowWorkerM1、SnowWorkerM2、SnowWorkerM3等接口类，方便继承重写。#134
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1764564459 wants to merge 1 commit intoyitter:masterfrom
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1、公开ISnowWorker、SnowWorkerM1、SnowWorkerM2、SnowWorkerM3等接口类，方便继承重写。#1341764564459 wants to merge 1 commit intoyitter:masterfrom
1764564459 wants to merge 1 commit intoyitter:masterfrom
