Working on restricting categories by membership
Merge branch 'refs/heads/development' into restrict_cats
Adding tabbed admin UI for membership settings
Working on restricting content by category
Adding shortcodes for cc_cart_subtotal, cc_cart_item_count, cc_visitor_name.
Fixing infinite redirection problem with cc_product_link shortcode when cart setting is stay or stay_ajax
Adding nofollow to all links that interact with the cloud
Implement admin setting for showing membership requirements metabox on any post type.
Merge branch 'refs/heads/development' into restrict_cats

Conflicts:
	CC/Admin.php
Restrict categories and filter category widget
Catch a possible exception that might be thrown if the API call fails.
Incrementing version number to 1.5.3.1
Making subdomain a static variable to reduce cloud callbacks
Updating cc_product shortcode to render divs for loading product forms in batch via ajax
Enqueue cloud js library from CC_Library and make all CC_Library vars static for improved performance
Making the product data static to speed things up
Adding helper function to see if cart is empty
Fixing a bunch of PHP notices about calling static functions
Fixing more PHP notices about static class references
Implementing access denied redirect setting for individual pages