title: node-schedule-tz : Issue with timezone
body: <p>Why doesn't this work? </p>
  
  <pre><code>var tournRule = new schedule.RecurrenceRule();
  tournRule.dayOfWeek = 3;
  tournRule.hour = 03;
  tournRule.minute = 08;
  tournRule.tz = 'Central Time';
  </code></pre>
  
  <p>I have tried inputting so many different things into the **.tz = 'CDT'; section but no matter what, it doesn't trigger. I'm getting no errors at all from it. </p>
  
  <p>Tia!</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Thought I should add this too : </p>
  
  <pre><code>var tr = schedule.scheduleJob(tournRule, function() {
  console.log("Im online. Im online");
  })
  </code></pre>
  
  <p><strong>EDIT 2</strong></p>
  
  <p>I want to specify the timezone as the ESL team I am developing the bot for have different schedules for Central US Players and UK Players.</p>