title: Swift 2.0 calendar components error
body: <p>Hi I get this error in swift 2.0 </p>
  
  <p>Cannot invoke 'components' with an argument list of type '(NSCalendarUnit, fromDate: NSDate?, toDate: NSDate?, options: nil)'</p>
  
  <pre><code>var hoy = dataFormatter.stringFromDate(NSDate())
          var despues = dataFormatter.stringFromDate(fecha)
          var calHoy = dataFormatter.dateFromString(hoy)
          var calcDesp = dataFormatter.dateFromString(despues)
          let cal = NSCalendar.currentCalendar()
          let unit:NSCalendarUnit = .Day
          let components = cal.components(unit, fromDate: calcDesp, toDate: calHoy, options: nil) 
  </code></pre>