title: use of 'postion: relative' with jsPlumb?
body: <p>Firstly I am experimenting with (new to) jsPlumb. I couldn't seem to find the following in the jsPlumb documentation or by googling and am now going round in circles so it must be time to just go ahead and ask: Basically, can I relatively position elements and have them work with jsPlumb?</p>
  
  <p>E.g. The following works perfectly</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;&lt;html&gt;
  &lt;head&gt;
     &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"&gt;&lt;/script&gt;
     &lt;script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js"&gt;&lt;/script&gt;
     &lt;script type='text/javascript' src="PATH/TO/jquery.jsPlumb-1.3.16-all-min.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
     &lt;div style='position: absolute; background-color: yellow; width: 100px; height: 100px' id='box1'&gt;Box 1&lt;/div&gt;
     &lt;div style='position: absolute; background-color: pink; width: 100px; height: 100px' id='box2'&gt;Box 2&lt;/div&gt;
  &lt;/body&gt;
  
  &lt;script type='text/javascript'&gt;
      jQuery(document).ready( function(){
  
         jsPlumb.draggable("box1");
         jsPlumb.draggable("box2");
  
         var e0 = jsPlumb.addEndpoint("box1", {
             endpoint:"Dot",
             anchor:"AutoDefault"
         });
  
         var e1 = jsPlumb.addEndpoint("box2", {
             endpoint:"Dot",
             anchor:"AutoDefault"
         });
  
         jsPlumb.connect({ source:e0, target:e1 });
  })
  &lt;/script&gt;
  
  &lt;/html&gt;
  </code></pre>
  
  <p>but if I change `position: absolute` to `position: relative` for the boxes then the behaviour becomes erratic (particularly when dragging the boxes beyond the current view). Does jsPlumb require absolutely positioned elements only? What happens if I want my elements to initialise relatively positioned? Apologies if this (kind of) question has been asked or its in the documentation somewhere - but I couldn't find it.</p>