Magpile Store inventory manager

This is a mock-up of the new Inventory management page on the Magpile Store. Instead of having a page for each item, they are all listed on one page as concise as I could make it. Spreads can now be added with drag and drop (instead of having to load an overlayed iframe) and it's now much clearer when scrolling the page which items are visible in your Store.

Just coding this up now. It's probably my favourite page of the redesign.