Support extended Descriptions

[janschaefer]

It would be nice if one could add an extended description to a step method. This could be shown in the report as a tooltip, for example. The extended description could provide more detailed information about a step.

Example:

class GivenCustomer {

   @ExtendedDescription("Sets up a default customer in the database."
      + "<br>The customer has name 'John' and lastname 'Doe' " 
      + "as well as email address 'john@doe.com'");
   public void a_customer() {
       ...
   }
}

For sure it would be nice if instead the JavaDoc of the method could be used, but that would require a separate parsing of the Java source, so this would be rather difficult to achieve without major effort.