brands#index: impl tree-input for category_name
tree-input: refactor to a cool version
stores#edit_fixture: store_fixture add/remove
db seed: users, fixtures
fixed typo
css: fix dataTable filter style, add class dataTables_filter
tree-input: add data-url options for category input
locales: fixed default labels for simple_form
brands/bays/products#index: category-input, dataTable
schema for product: add grade instead of sale_type
tree-input: add min-input-level