title: Bootstrap Datepicker - Set startView: 'decade', but not current decade
body: <p>Currently I have the startView showing the current decade, which is ok but I want to make the previous decade be the startView - not the current decade.</p>
  
  <pre>
  this.dobDatePickerView = new DatePickerView({
    el: this.$('[name="dob"]'),
    startView : 'decade',
    endDate   : this.sandbox.dates().fwFormat('date'),
    value     : this.sandbox.dates().subtract('years', 18).fwFormat('date')
  }).render();
  </pre>
  
  <p>I want to subtract 18 years from the decade view default selected year, so instead of '2013' being pre-selected it should default to 1995.</p>