Add search and copy password in extension

- no lock screen for now
- share keychain between app and extension

passextension/UtilsExtension.swift

@@ -0,0 +1,18 @@
+//
+//  UtilsExtension.swift
+//  pass
+//
+//  Created by Yishi Lin on 13/6/17.
+//  Copyright © 2017 Bob Sun. All rights reserved.
+//
+
+import Foundation
+import passKit
+
+extension Utils {
+    static func alert(title: String, message: String, controller: UIViewController, handler: ((UIAlertAction) -> Void)? = nil, completion: (() -> Void)? = nil) {
+        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
+        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: handler))
+        controller.present(alert, animated: true, completion: completion)
+    }
+}