move redux from sample to runtime.

add thunk middleware.

Runtime/redux/redux_logging.cs

                 var result = next.dispatch(action);
                 var afterState = store.getState();
                 var afterStateDump = JsonUtility.ToJson(afterState);
-                Debug.LogFormat("Action name={0} data={1}", action.GetType().Name, JsonUtility.ToJson(action));
+                Debug.LogFormat("Action name={0} data={1}", action.ToString(), JsonUtility.ToJson(action));
                 Debug.LogFormat("previousState=\n{0}", previousStateDump);
                 Debug.LogFormat("afterState=\n{0}", afterStateDump);
                 return result;

Runtime/redux/redux_thunk.cs

         public static Middleware<State> create<State>() {
             return (store) => (next) => new DispatcherImpl((action) => {
                 var thunkAction = action as ThunkAction<State>;
-                if (thunkAction != null) {
+                if (thunkAction != null && thunkAction.action != null) {
                     return thunkAction.action(store.dispatcher, store.getState);
                 }
                 
 
     public sealed class ThunkAction<State> {
         public readonly Func<Dispatcher, Func<State>, object> action;
+        public readonly string displayName;
-        public ThunkAction(Func<Dispatcher, Func<State>, object> action) {
+        public ThunkAction(
+            Func<Dispatcher, Func<State>, object> action = null,
+            string displayName = null) {
+            this.displayName = displayName ?? "";
+        }
+
+        public override string ToString() {
+            return "ThunkAction(" + this.displayName + ")";
         }
     }
 }

Samples/ReduxSample/ObjectFinder/Reducer.cs

 
     public static class SearchAction {
         public static ThunkAction<FinderAppState> create(string keyword) {
-            return new ThunkAction<FinderAppState>((dispatcher, getState) => {
+            return new ThunkAction<FinderAppState>(
+                displayName: "SearchAction",
+                action: (dispatcher, getState) => {
                 var objects = UnityEngine.Object.FindObjectsOfType(typeof(FinderGameObject)).Where(
                     obj => keyword == "" || obj.name.ToUpper().Contains(keyword.ToUpper())).Select(
                     obj => new GameObjectInfo {id = obj.GetInstanceID(), name = obj.name}).ToList();