message: demo(input): Add Floating Label Input to Demo
diff: <ion-input required type="text" oninput="handleLastNameValue(event)"></ion-input>
  </ion-item>
  + <ion-item>
  + <ion-label position="floating">Title</ion-label>
  + <ion-input></ion-input>
  + </ion-item>
  +
  <ion-item>
  <ion-label position="stacked">Address</ion-label>
  <ion-input placeholder="Address Line 1"></ion-input>
  