title: text of md-autocomplete with md-float-label becomes invisible when leaving the input
body: <p>Everything works very nice, but when you click outside the autocomplete input the text gets invisible, if you click in the input it goes black again and you see it is there.
  Here is my html:</p>
  
  <pre><code>   &lt;body ng-app='myapp' layout="column" ng-controller="autocompleteController as ctrl"&gt;
  &lt;md-content layout-align="center" layout="row"&gt;
  &lt;md-input-container style="background-color: #3C83E1; padding: 1vh 1vh 1vh 1vh" flex="33" class="md-whiteframe-4dp"&gt;
      &lt;div layout="row" layout-align="center center" style="margin-bottom: 1vh; margin-top: 1vh"&gt;
          &lt;img src="http://www.simplesdental.com/assets/img/simplesdental-logo-b.svg"&gt;
      &lt;/div&gt;
      &lt;md-autocomplete
              md-no-cache="ctrl.noCache"
              md-autoselect="true"
              md-search-text="ctrl.searchText"
              md-items="item in ctrl.queryProcurar(ctrl.searchText)"
              md-item-text="item.name"
              md-floating-label="Nome do Paciente"
      &gt;
          &lt;span md-highlight-text="ctrl.searchText"&gt;{{item.name}}&lt;/span&gt;
          &lt;md-not-found&gt;
              N&amp;atilde;o foi encontrado um paciente com o nome "{{ctrl.searchText}}".
          &lt;/md-not-found&gt;
      &lt;/md-autocomplete&gt;
  
  &lt;/md-input-container&gt;
  </code></pre>
  
  <p>
  </p>
  
  <p>and my js:</p>
  
  <pre><code>    angular.module('myapp', ['ngMaterial'])
          .controller("autocompleteController", function ($http) {
              Object.filter = function (obj, predicate) {
                  var result = {}, key;
                  for (key in obj) {
                      if (obj.hasOwnProperty(key) &amp;&amp; !predicate(obj[key])) {
                          result[key] = obj[key];
                      }
                  }
                  return result;
              };
              this.queryProcurar = function (query) {
                  return $http.get("https://jsonplaceholder.typicode.com/users")
                      .then(function (response) {
                          var res = response.data.filter(function (obj) {
                              return obj.name.toLowerCase().indexOf(query.toLowerCase()) != -1;
                          });
                          return res;
                      })
              }
          })
  </code></pre>
  
  <p>here, a demo: <a href="http://codepen.io/iurypiva/pen/YZQeBN" rel="nofollow noreferrer">http://codepen.io/iurypiva/pen/YZQeBN</a></p>