title: Don't show hours in 1 month zoom Highstock
body: <p>I need to hide the hours when zoomed to 1 month.</p>
  
  <p>I have a demo here: <a href="http://dev.feldsam.cz/unipetrol-stock/" rel="nofollow">http://dev.feldsam.cz/unipetrol-stock/</a></p>
  
  <p>I tried to use <code>tickPositioner</code>:</p>
  
  <pre><code>tickPositioner: function(min, max) {                
      var diff = max - min;
  
      // month
      if(diff &lt;= 31 * 24 * 3600 * 1000 &amp;&amp; diff &gt; 24 * 3600 * 1000) {
          var date = new Date(max);
          var minus = date.getHours() * 3600 * 1000;
          max = max - minus;
  
          var pos,
          tickPositions = [],
          tickStart = new Date(date.getFullYear(), date.getMonth(), 1).getTime();
  
          for (pos = tickStart; pos &lt;= max; pos += (5 * 24 * 3600 * 1000)) {
              tickPositions.push(pos);
          }
  
          tickPositions.info = {
              unitName: "day",
              higherRanks: {} 
          };
  
          this.options.ordinal = false;
  
          return tickPositions;
      } else {
          this.options.ordinal = true;
      }
  }
  </code></pre>
  
  <p>But the hours are still showing. Also, when I click from one month to another, ordinal is still false.</p>