Export createStore function rather than store, remove mock user

Author: aselbie

src/index.js

@@ -2,4 +2,4 @@ import configureStore from './store/configureStore'
 
 export * from './actions'
 
-export default configureStore()
+export default configureStore

src/reducers/index.js

@@ -8,9 +8,7 @@ const defaultState = {
 }
 
 function user(state, action) {
-  return {
-    id: "23061405"
-  }
+  return state || {}
 }
 
 // Updates an entity cache in response to any action with response.entities.