cleaned up user#show page.
user can now sign up as a vendor or a customer. added some sugar to the cart page so that if the cart is empty, it tells you so, then provides a link to the store
if someone tries to sign up as a vendor, it noew requires several more fields than if they try and sign up as a customer
NOW validations work properly if a vendor is trying to sign up. these validations only are put into effect if the person tries to sign up as a vendor. BEAUTIFUL
Merge branch 'tues'