feat setup: Setup Redux, Immutable.js and React

feat FileList: Implement File List + changedir action

src/js/reducers/all.js

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+import Immutable from 'immutable';
+import cwd from './cwd';
+import files from './files';
+
+export default function(state = new Immutable.Map(), action) {
+  return new Immutable.Map({
+    cwd: cwd(state.get('cwd'), action),
+    files: files(state.get('files'), action)
+  });
+}

src/js/reducers/cwd.js

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+import { CHANGE_DIRECTORY } from 'actions/types';
+import listFiles from 'actions/list-files';
+import { children } from 'api/files';
+import store from 'store';
+
+export default function(state = '/', action) {
+  switch (action.type) {
+    case CHANGE_DIRECTORY:
+      children(action.dir).then(files => {
+        store.dispatch(listFiles(files));
+      });
+      return action.dir;
+    default:
+      return state;
+  }
+}

src/js/reducers/files.js

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+import { LIST_FILES } from 'actions/types';
+
+export default function(state = [], action) {
+  switch (action.type) {
+    case LIST_FILES:
+      return action.files;
+    default:
+      return state;
+  }
+}