Add ModelCacheStoreMemory and tests
Fix setup.packages
Fix import json
Update README desc
rename to storage
Add LoadData#load_from with test
Add original_model should be seted
感谢晓光提示了用 类装饰器
大幅度重构，用装饰器实现 ModelCache.config
集成init_datadict到类声明里
修复 ModelCache.pull_data