Add a way to load collections in another bucket

[Natim]

If I have the following yaml file:

chefclub:
    collections:
        categories:
                ...

I'd like to be able to use kinto-wizard to load this file in chefclub-preview rather than chefclub

kinto-wizard load recipes.yaml --bucket "chefclub:chefclub-preview"

or

kinto-wizard load recipes.yaml --bucket "chefclub" --dest-bucket "chefclub-preview"

What do you think?

Right now I just do:

sed -i "s/^chefclub:$/chefclub-preview:/g" recipes.yaml