Fixed typo in .flash.error
Fixed: Wasn't showing the auth links (Log in, My Account, Log out).

Updated some overrides to reflect the new partials in Spree 1.3.
(spree/shared/_store_menu was moved to spree/shared/_nav_bar, for example)
Added an overview of how we transform the header as it rendered by core + spree_auth_devise into the
a header with all links on one line.
Fixed: On the order show page, the fieldset#order_summary was stretching out to 940px, even though
its container is only 910px. This was causing the order total amount, etc. to be cut off and be
rendered partially outside of #content.

This whole deal with having only 910px of room instead of 940px is causing a lot of problems. Maybe
we should just widen it so we have 940px to work with? (Would have to update wrapper-back*.png)