Added ability to calculate cart item totals and total value of cart.
Added migrations
Cleaned up profile models and add a signal for when a user is created.
Separated checkout from core
Added login_required to add to cart and cleaned up template
Fixed issue with orders table name
Added checkout to main urls
Removed pass statement
Updated settings with new modules and third party configurations
Added restrictions to admin
Added utils and updated logout and activation pages.
Split the settings file into three separate settings for each store
Updated readme with the latest instructions.
Merge pull request #4 from naqeeb/4_add_checkout

Added checkout app