Fix CustomCollectionView-Swift sample (#22)

* Updated copyright notices

* Fixed crash and removed storyboard

examples/CustomCollectionView-Swift/Sample/ImageCellNode.swift

@@ -2,19 +2,22 @@
 //  ImageCellNode.swift
 //  Sample
 //
-//  Created by Rajeev Gupta on 11/9/16.
-//
 //  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
 //  This source code is licensed under the BSD-style license found in the
 //  LICENSE file in the root directory of this source tree. An additional grant
 //  of patent rights can be found in the PATENTS file in the same directory.
+//  Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
+//  Pinterest, Inc.  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
 //
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-//  FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-//  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//      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.
 //
 
 import UIKit
@@ -29,9 +32,6 @@ class ImageCellNode: ASCellNode {
   }
 
   override func layoutSpecThatFits(_ constrainedSize: ASSizeRange) -> ASLayoutSpec {
-    let imageSize = imageNode.image?.size
-    print("imageNode= \(imageNode.bounds), image=\(imageSize)")
-    
     var imageRatio: CGFloat = 0.5
     if imageNode.image != nil {
       imageRatio = (imageNode.image?.size.height)! / (imageNode.image?.size.width)!