Added a CATEGORY.Order field
Added category order support

Categories should sort on category, then name. That way if none of the categories are set, they'll still behave the same.
Added support for CATEGORY.Order. Default order is 0. The lower an order is, the farther left it will be. After sorting by order, it will sort by name. This also fixes what I believe is a bug where categories are sorted Z-A.
Merge pull request #46 from NullEntity/master

Added support for CATEGORY.Order and fixed categories sorting Z-A