title: md-autocomplete to blur itself after item is selected
body: <p>I have an <code>md-autocomplete</code> which populates with addresses. When an address is selected the focus stays on the element. I would like the <code>md-autocomplete</code> to blur as soon as an address is selected by the user.</p>
  
  <p>The reason is because when done on a mobile phone, the keyboard should hide automatically once the user has selected the address, whereas currently the keyboard stays displayed after address selection.</p>
  
  <p>Thanks!</p>