[_refactored] properties into own folder

Reviewers: O3 Material JavaScript platform reviewers, #material_motion, O2 Material Motion, featherless

Reviewed By: #material_motion, O2 Material Motion, featherless

Tags: #material_motion

Differential Revision: http://codereview.cc/D2493

packages/streams/src/ReactiveProperty.ts → packages/streams/src/properties/ReactiveProperty.ts

@@ -22,12 +22,12 @@ import {
 
 import {
   IndefiniteSubject,
-} from './IndefiniteSubject';
+} from '../IndefiniteSubject';
 
 import {
   ScopedReadable,
   ScopedWritable,
-} from './types';
+} from '../types';
 
 export class ReactiveProperty<T> implements Observable<T>, ScopedReadable<T>, ScopedWritable<T> {
   // ReactiveProperty delegates all of its reactive functionality to an internal

packages/streams/src/properties.ts → packages/streams/src/properties/constantProperty.ts

@@ -16,10 +16,11 @@
 
 import {
   ScopedReadable,
-} from './types';
+} from '../types';
 
 export function constantProperty<T>(value: T): ScopedReadable<T> {
   return {
     read: () => value,
   };
 };
+export default constantProperty;

packages/streams/src/properties/index.ts

@@ -0,0 +1,21 @@
+/** @license
+ *  Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ *  use this file except in compliance with the License. You may obtain a copy
+ *  of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *  License for the specific language governing permissions and limitations
+ *  under the License.
+ */
+
+export * from './ReactiveProperty';
+export { default as ReactiveProperty } from './ReactiveProperty';
+
+export * from './constantProperty';
+export { default as constantProperty } from './constantProperty';