Add recent scope to sales_order model.
Add jqplot_helper.js
Add a helper to remove labels in small bars.
Sort records in sales_order's recent scope.
Add more info to admin/customers/show page.
Fetch sales datum in the action.
Plot charts in the page.
Add service_categories scope to product_category model.
Show more info in show pages.
Add common plot functions to admin.js.coffee.