Continued development on carts

- Created API page on plugin activation
- Changed ‘products’ post type to be ‘product’ (fits WP naming
structure better)
- Removed Unnecessary features from ‘orders’ post type
- Added functionality to display item within a cart (via metabox in
admin)
- General file management, moved functions around to proper
files/directories
Merge branch 'master' of https://github.com/funkhaus/store

Conflicts:
	core/js/store.api.js
	core/store-ajax-api.php
	core/store-cart-functions.php
	core/store-post-types.php
	core/store-product-functions.php