Fix a overflow problem observed with IE
Many changes to make maphilight work for our reactive design site.
- Automatically bind to the rwdImageMaps events.
- For every option "foo" you can now also set a "alwaysOnFoo" option
- Alternative method to insert the canvas without adding a wrapper
<div>. 
  Set use option 'useWrapper' to false to activate.
- Other changes I don't remember