Merge pull request #7 from delynn/leverage_spree_user

Use the configured spree user class.
Update spec.
Merge pull request #6 from delynn/fix_default_admin_permissions

Fix default admin permissions for Spree 2.1.
Merge pull request #5 from delynn/admin_enhancements

Adjust views to match the current admin interface.
Merge remote-tracking branch 'upstream/2-1-stable' into 2-1-stable

* upstream/2-1-stable:
  Update spec.