Find a resource by name and return it as a
Resource object.
Parameters: resourceName - Designates the resource; typically structured by slashes ("/") like "com/foo/pkg/Bar.class" null if the resource could not be found
Find a resource by name and open it for reading.
Parameters: resourceName - Designates the resource; typically structured by slashes ("/") like "com/foo/pkg/Bar.class" null if the resource could not be found throws: IOException - The resource was found, but there are problems opening it