Clean up the example projects and codes (#512)

* Clean up Samples and Maps examples
* Rename the root view controller in Maps/Stocks/SampleObjC examples
* Reorder resource file references
* Rename examples' bundle ids with `example` domain.
* Remove 'Run Script' to modify CFBundleVersion: now this has not been used for testing since unit tests were added
* Revise methods to handle content view controllers in UseCaseController
* Fix a bug on PagePanelController

Examples/Samples/Sources/ContentViewControllers/NestedScrollViewController.swift

@@ -0,0 +1,18 @@
+// Copyright 2018 the FloatingPanel authors. All rights reserved. MIT license.
+
+import UIKit
+
+final class NestedScrollViewController: UIViewController {
+    @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var nestedScrollView: UIScrollView!
+
+    @IBAction func longPressed(_ sender: Any) {
+        print("LongPressed!")
+    }
+    @IBAction func swipped(_ sender: Any) {
+        print("Swipped!")
+    }
+    @IBAction func tapped(_ sender: Any) {
+        print("Tapped!")
+    }
+}