Order in menu or category

This request includes adding the ability to reorder menu items in a category as well as preventing navigation to pages that require authentication when you're not logged in. There will need to be a small change when the API supports sending multiple items in a single update. Also, there still needs to be logic for modifying category orders.
_ is not part of angular. It is a library called Lodash. https://lodash.com/. Think of the underscore like the jquery $.