Begin work on cart functionality.
Merge changes in from master.
Set up basic ajax functionality for cart.
Remove from cart function.
Give user response to ajax actions.
Add navigation view to avoid code repetition.
Work on styling and buttons for search and cart screens.
Cart counters.
Highlight articles on search screen that are already in cart, link to cart page.
Enable checkout button.
Update cart checkout to work on all screens.
Verify articles in cart.  Unfinished.
More work on verification of articles.
Handler for unavailable articles in cart.
Hide cart tab when empty.
UI touchups for cart.
Show spinner when doing article checks.
Version 1.3.0 bump.
Merge pull request #16 from devinsays/cart

Cart