Fixed problem with Controllers having a path parameter on the class mapp...

For a controller that has a path variable in the class-level RequestMapping *and* uses a path variable for a method it was not possible to link to the method

    linkTo(methodOn(ControllerWithClassMappingVariable.class, "bar").getFoo("baz") ;

so that the resulting path would correctly contain the substituted variables bar and baz.

See test and solution in the pull request.