title: jQuery UI Datepicker disable all days before certain date
body: <p>Is there any way of using the <code>minDate</code> in order to disable all days before a certain date? I know I can use <code>minDate: 0</code> to disable all days before the current date, but I need to specificy a date and disable all dates before that date.</p>
  
  <p>I could also use showDaysBefore but I think I will have to define a list of all days I want to disable..</p>