Fix 2.2 installer incompatibility.

Spree stores now serve up application.css/js instead of splitting them
in to store and admin.
Use correct path to the CSS/JS.
Merge pull request #55 from gmacdougall/fix-2-2-install

Fix 2.2 installer incompatibility.
Merge pull request #55 from gmacdougall/fix-2-2-install

Fix 2.2 installer incompatibility.
Update orders totals on add to cart.

When a gift card was added to the cart, there was a state which could
occur in Spree 2.2 where the order total was not correct.

Calling order.update_totals ensures that the total is correct.
Merge pull request #57 from JDutil/2-2-stable

Merge pull request #55 from gmacdougall/fix-2-2-install
Add a feature spec for cart total.
Merge pull request #56 from gmacdougall/update-order-totals-on-add-to-cart

Update orders totals on add to cart.