nexus-flux:简化的Flux抽象接口，适用于各种后端

Nexus Flux 抽象Nexus流量图 +-> Action.dispatch ---+--> Client.Events ---+--> Action.onDispatch -+ | Fire & forget Stream Callback | Component logic Adapter Adapter Global logic | Callback Stream Fire & forget | +-- Store.onUpdate <--+--- Server.Events <--+------ Store.update -