Fix for order details showing shipments total instead of tax total.
Fix products linking to the wrong URLs.
Mark a test as inaccessible to match Spree.
Add missing order_spec test from spree/spree.
Mark a test as inaccessible to match spree/spree.
Sync changes for link_to_cart from spree/spree.
Fix 3 failing tests for the cart and product pages.

The tests in spree_frontend use the values previous to this change.
I can't track down why spree_bootstrap_frontend is returning different
values. However, the values that spree_bootstrap_frontend uses seem
correct.
Merge branch 'master' of https://github.com/200Creative/spree_bootstrap_frontend into spree_master_with_bootstrap_fork