Support navigating to page instances in addition to classes

[geb-bot]

Originally created by Luke Daley.

it should be possible to do:

class ProductPage extends Page {
  String productId

  ProductPage(String productId) {
    this.productId = productId 
  } 

  static at = { title == "Product '$productId'" }
}

to new ProductPage("myId")

After this change, to(SomePage) becomes just shorthand for to(new SomePage()).

We will have to add some formal kind of notion of initialised to Pages. Initialisation is performed by Geb (in Browser) which is where the backing navigator is attached to the Page instance.

If a user tries to use Geb functionality (e.g. Navigator method) on an uninitialised page they should get an appropriate error.

If they try to initialise an already initialised page they should get an appropriate error message (e.g. to(to(new SomePage())).

[geb-bot]

Resolved