Adds args for intermediate objects

[helrond]

Adds arguments for Annotation and AnnotationPage.

I didn't add **kwargs for AnnotationHelpers.add_annotation because we're already passing in a pre-fab Annotation object, so since we're not creating an Annotation from scratch it makes less sense to do that (IMO). Happy to be contradicted though.

Fixes #111

[digitaldogsbody]

Looks great, thanks Hillel :) I agree with the rationale for not passing **kwargs to add_annotation.

Can we add the anno_page_id also to the make_annotation helper so that it can be passed through even when you don't have an Annotation object pre-created, when that function calls the now-fixed add_annotation?

[giacomomarchioro]

That looks very good to me! That are only two observations that come to my mind but probably is better to address them in a separate issue:

1. in the case of a Canvas you can add an Annotation to the items or to the annotations list. How can you differentiate? In this case, the Annotation helper is inserting by default the annotation to the annotations list.
2. shall we provide the ability to set the format and the id of the body as args of the function, in case I want to show lower resolution or rotated images in the create_canvas_from_iiif?

[helrond]

OK, after (too many) commits, I think I address @digitaldogsbody's comment.

@giacomomarchioro - I agree these are separate issues!

[digitaldogsbody]

1. in the case of a Canvas you can add an Annotation to the `items` or to the `annotations` list. How can you differentiate? In this case, the Annotation helper is inserting by default the annotation to the annotations list.

I think that make_canvas/add_canvas should cover the first, and make_annotation/add_annotation the second.

2. shall we provide the ability to set the format and the id of the body as args of the function, in case I want to show lower resolution or rotated images in the create_canvas_from_iiif?

This is a good idea - maybe also a separate helper targeted at the annotation body SpecificResource instance that allows manipulation after (in the manner of the set_hwd helpers)?