title: Angular UI Bootstrap DatePicker initDate Issue
body: <p>I am trying to set init-date in angular bootsrap's datepicker directive. And I am getting the below error</p>
  
  <blockquote>
    <p>Error: [$parse:syntax] Syntax Error: Token 'Jun' is an unexpected token at column 5 of the expression [Sun Jun 21 2015 17:00:00 GMT-0700 (PDT)] starting at [Jun 21 2015 17:00:00 GMT-0700 (PDT)].</p>
  </blockquote>
  
  <p>Below is the mark up I am using</p>
  
  <pre><code>&lt;div ng-controller="DatepickerDemoCtrl"&gt;
  &lt;h4&gt;Popup&lt;/h4&gt;
  &lt;div class="row"&gt;
      &lt;div class="col-md-6"&gt;
          &lt;p class="input-group"&gt;
              &lt;input type="text"
                     class="form-control"
                     init-date="dateOptions.initDate"
                     datepicker-popup="{{format}}"
                     ng-model="dt"
                     is-open="opened"
                     min-date="dateOptions.minDate"
                     max-date="'2016-06-22'"
                     datepicker-options="dateOptions"
                     date-disabled="disabled(date, mode)"
                     ng-required="true" close-text="Close" /&gt;
            &lt;span class="input-group-btn"&gt;
              &lt;button type="button" class="btn btn-default" ng-click="open($event)"&gt;&lt;i class="glyphicon glyphicon-calendar"&gt;&lt;/i&gt;&lt;/button&gt;
            &lt;/span&gt;
          &lt;/p&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p></p>
  
  <p>and here is the javascript side I have in place</p>
  
  <pre><code>angular.module('app', ['ui.bootstrap']);
  angular.module('app').controller('DatepickerDemoCtrl', function ($scope) {
      $scope.open = function($event) {
          $event.preventDefault();
          $event.stopPropagation();
  
          $scope.opened = true;
      };
      $scope.dateOptions = {
          formatYear: 'yy',
          startingDay: 1,
          minDate: new Date(2015, 9, 9),
          initDate: new Date('2015-06-22')
      };
      $scope.format = ['MM-dd-yyyy'];
  });
  </code></pre>
  
  <p>Not exactly sure what I might be missing here...can someone help?</p>