added rails_admin
Renamed InventoryItem model to Product. Added products_controller
added cart and cart_items models
Added seed data, and some bug fixes
Added seed data, and some bug fixes
Added product_variant model and some seed data
Merge branch 'adding_rails_admin' of github.com:ketan21/x into adding_rails_admin

Conflicts:
	app/models/product.rb
	db/seeds.rb
updated code