split product functionality from review functionality.
create working review form and route to show/review page.
change review slidebar to number_field
Merge branch 'master' of https://github.com/kemccabe/betsy_rails

Conflicts:
	app/models/product.rb
	config/routes.rb
	db/schema.rb
fix merge conflict in routes file
change categories link on root
fix merge conflicts in product model and show_product view
add associations between Category and Product model
fix merge conflict