Clean up examples directory

sky/examples/city-list/city-sequence.sky

-<!--
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
--->
-<script>
-function StateHeader(state) {
-  this.state = state;
-  this.headerOrder = 1;
-};
-
-function LetterHeader(letter) {
-  this.letter = letter;
-  this.headerOrder = 2;
-}
-
-function CitySequence(cities)
-{
-  this.items = [];
-  this.cursor = 0;
-
-  var lastState;
-  var lastLetter;
-
-  for (var i = 0; i < cities.length; i++) {
-    var city = cities[i];
-    if (!lastState || lastState.state != city.state) {
-      lastState = new StateHeader(city.state);
-      this.items.push(lastState);
-      lastLetter = undefined;
-    }
-    if (!lastLetter || lastLetter.letter != city.name[0]) {
-      lastLetter = new LetterHeader(city.name[0]);
-      this.items.push(lastLetter);
-    }
-    this.items.push(city);
-  }
-};
-
-CitySequence.prototype = {
-  append: function(other) {
-    var lastCity = this.items[this.items.length - 1];
-    var firstOtherCity = other.items[2];
-
-    var index = 0;
-    if (firstOtherCity.state == lastCity.state) {
-      // skip StateHeader
-      if (firstOtherCity.name[0] == lastCity.name[0]) {
-        // skip LetterHeader
-        index = 2;
-      } else {
-        index = 1;
-      }
-    }
-
-    for (; index < other.items.length; index++) {
-      this.items.push(other.items[index]);
-    }
-  }
-};
-
-module.exports = CitySequence;
-
-</script>