Settings: Add, Edit, delete Categories from list of categories

Overview: There are a number of category lists that appear on the Vendor form. The potential categories that populate these lists should be editable in Vendor settings.

Requirements:

• Add Vendor=>Categories area to settings
• User has the ability to Create, Edit and Delete category terms
• Include system default categories

1. Accounting, Books, Customer Service, Databases, Ebooks, Econtent, General, Journals, Licenses, Primary, Sales, Serials, Returns, Shipments, Payments, Technical Support, Other

• Display in table: category name, description, number of associations, action icons

1. Number of associations is the number of times that category appears on vendor records

Note: this issue may require the creation of stories for mod-vendors-storage when it is pointed.