Fixing librarian-ansible so it works!!

 - Move `resolve_with_librarian` to `#prepare_roles` function

 - Ensure roles in Ansiblefile are installed to sandbox roles path: `tmp_roles_dir`

 - Fix `roles_path` in `ansible.cfg` so it points to top-level roles dir in `kitchen_root` (e.g.: `/tmp/kitchen/roles`)
Merge pull request #12 from trinitronx/fix-ansible-librarian-for-roles

Fixing librarian-ansible so it works!!