title: ScheduleExpression and increments
body: <p>I was experimenting with <code>ScheduleExpression</code> and noticed a strange behavior:</p>
  
  <p>If I create a timer every 30 seconds with</p>
  
  <pre><code>scheduleExpression.second("*/30");
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>[second=*/30;minute=*;hour=*;dayOfMonth=*;month=*;dayOfWeek=*;year=*;timezoneID=null;start=null;end=null]
  </code></pre>
  
  <p>and my timer is executed every 30 seconds (at :00 and :30) as expected. So far so good.</p>
  
  <p>I then tried to do the same with minutes</p>
  
  <pre><code>scheduleExpression.minute("*/1");
  </code></pre>
  
  <p>and as expected I get</p>
  
  <pre><code>[second=*;minute=*/1;hour=*;dayOfMonth=*;month=*;dayOfWeek=*;year=*;timezoneID=null;start=null;end=null]
  </code></pre>
  
  <p>but my <code>@Timeout</code> method is called continuously. The code is exactly the same I am just changing the <code>ScheduleExpression</code>.</p>
  
  <p>Is this a know issue? Or did I misinterpret the documentation and I have to set both</p>
  
  <pre><code>scheduleExpression.second(0);
  scheduleExpression.minute("*/1");
  </code></pre>