title: md-autocomplete generating the same model in ng-repeat
body: <p>md-autocomplete generating the same model in ng-repeat
  if the value of one changes reflect in other fields as well,
  How can I add different ng model to it?</p>
  
  <pre><code>&lt;tr ng-repeat="school in ctrl.schools" ng-if="ctrl.editAcademyToggle"&gt;
  &lt;td&gt;
  &lt;md-input-container&gt;
  &lt;div class="mdInputContainer"&gt;
      &lt;md-autocomplete flex required flex-gt-sm="25"
          md-autofocus="true"
          md-selected-item="school.college_name"
          md-clear-button="false"
          md-input-name="school.college"
          md-input-minlength="3"
          md-no-cache="false"
          md-search-text="ctrl.academySearchStr"
          md-items="item in ctrl.searchAcademySchools(ctrl.academySearchStr)"     
          md-item-text="item.name"&gt;
          &lt;md-item-template&gt;
              &lt;span class="item-title"&gt;
                  &lt;span&gt; {{item.name}}, {{item.city}}, {{item.state}}, {{item.zip}}&lt;/span&gt;
              &lt;/span&gt;
          &lt;/md-item-template&gt;
          &lt;md-not-found&gt;
              &lt;span ng-if="ctrl.academySearchStr.length &lt; 3"&gt;Minimum 3 Charaters&lt;/span&gt;
              &lt;span ng-if="ctrl.academySearchStr.length &gt;= 3"&gt;
                Wait a few more seconds before searching again"
              &lt;/span&gt;
          &lt;/md-not-found&gt;
          &lt;div ng-messages="ctrl.leadEntryForm.school.college.$error"&gt;
              &lt;div ng-message="required"&gt;This field is required&lt;/div&gt;
          &lt;/div&gt;
      &lt;/md-autocomplete&gt;
  &lt;/div&gt;
  &lt;/md-input-container&gt;
  &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>The Generated Model Coming something like this for all Rows : </p>
  
  <pre><code>ng-model="$mdAutocompleteCtrl.scope.searchText"
  </code></pre>