title: How to add a border to the title in highcharts
body: <p>I want to add custom css rules to the title of a chart generated by highcharts. 
  More precisely i am trying to add a backgound and a border. i tried several approaches however the most stable one is as follows; </p>
  
  <pre><code> title: {
              style: {
                  color: '#FF00FF',
                  fontWeight: 'bold',
                  background-color: 'green',
                  border: '1px'
              }
          },
  </code></pre>
  
  <p>This code works for the color and weight of the font but other options do not work , i also tried (backgroundColor)</p>
  
  <p>ex.=> 
  <a href="http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/title/style/" rel="nofollow">http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/title/style/</a></p>