docs(demos): local storage api demo

demos/local-storage/app.html

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+<ion-nav id="nav" [root]="rootPage" #content></ion-nav>
+<ion-overlay></ion-overlay>

demos/local-storage/index.ts

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+import {App, Page, IonicApp, Config, Platform} from 'ionic/ionic';
+import {Storage, LocalStorage} from 'ionic/ionic';
+
+
+@App({
+  templateUrl: 'app.html'
+})
+class ApiDemoApp {
+
+  constructor() {
+    this.rootPage = InitialPage;
+  }
+}
+
+@Page({
+  templateUrl: 'main.html'
+})
+export class InitialPage {
+  constructor() {
+    this.local = new Storage(LocalStorage);
+    this.myItem = {};
+    this.delKey = '';
+    this.localStorageDemo = '{}';
+    window.localStorage.clear();
+  }
+
+  set() {
+    this.local.set(this.myItem.key, this.myItem.value );
+    this.localStorageDemo = JSON.stringify(window.localStorage, null, 2);
+    this.myItem = {};
+  }
+
+  remove() {
+    this.local.remove(this.delKey);
+    this.localStorageDemo = JSON.stringify(window.localStorage, null, 2);
+    this.delKey = '';
+  }
+}

demos/local-storage/main.html

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+<ion-navbar *navbar>
+  <ion-title>Local Storage</ion-title>
+</ion-navbar>
+
+<ion-content padding>
+
+  <ion-row>
+    <ion-col width-33>
+      <ion-input>
+        <input type="text" placeholder="Key" [(ng-model)]="myItem.key">
+      </ion-input>
+    </ion-col>
+
+    <ion-col width-33>
+      <ion-input>
+        <input type="text" placeholder="Value" [(ng-model)]="myItem.value">
+      </ion-input>
+    </ion-col>
+
+    <ion-col width-34>
+      <button full secondary (click)="set()">
+        <icon add></icon>
+        set()
+      </button>
+    </ion-col>
+  </ion-row>
+
+  <ion-row>
+
+    <ion-col width-33>
+      <ion-input>
+        <input type="text" placeholder="Key" [(ng-model)]="delKey">
+      </ion-input>
+    </ion-col>
+
+    <ion-col width-34 offset-33>
+      <button full danger (click)="remove()">
+        <icon remove></icon>
+        remove()
+      </button>
+    </ion-col>
+  </ion-row>
+
+  <ion-row>
+    <b>Local Storage:</b>
+    <ion-col>
+    {{localStorageDemo}}
+    </ion-col>
+  </ion-row>
+<ion-content>