Add shouldEmitChange config to Store

- Provides config to set whether emitChange should be called
  automatically or not after store action listeners

docs/createStore.md

@@ -31,6 +31,12 @@ Available configuration options:
 
 `getState` receives the current state and returns a copy of it. You can override this function to provide your own implementation.
 
+#### shouldEmitChange
+
+> shouldEmitChange: boolean
+
+`shouldEmitChange` determines whether `emitChange` should be called automatically after action listeners finish executing. This is set to true by default.
+
 #### onSerialize
 
 `onSerialize` is also called before the store's state is serialized. You may optionally return an object, which will be used directly as the snapshot data for the store. If you do not return anything, the default, [`MyStore#getState()`](stores.md#storegetstate) is used for the snapshot data. See the [serialization](serialization.md) for an example.

src/alt/store/AltStore.js

@@ -55,15 +55,15 @@ class AltStore {
           return actionHandler.call(model, payload.data, payload.action)
         }, payload)
 
-        if (result !== false && !this.preventDefault) this.emitChange()
+        if (result !== false && !this.preventDefault && this.StoreModel.config.shouldEmitChange) this.emitChange()
       }
 
       if (model.reduce) {
         handleDispatch(() => {
           model.setState(model.reduce(this.state, payload))
         }, payload)
 
-        if (!this.preventDefault) this.emitChange()
+        if (!this.preventDefault && this.StoreModel.config.shouldEmitChange) this.emitChange()
       }
 
       this.lifecycle('afterEach', {

src/alt/store/index.js

@@ -47,7 +47,8 @@ export function createStoreConfig(globalConfig, StoreModel) {
     getState(state) {
       return fn.assign({}, state)
     },
-    setState: fn.assign
+    setState: fn.assign,
+    shouldEmitChange: true
   }, globalConfig, StoreModel.config)
 }