make restaurant resource

WIP, admin access tests
update test_helper#create_transaction_for method to find_or_create
Add migration to add restaurant_id to items
update item to accept restaurant_id
scope items#index to current_restaurant.  Routing not in place
Add restaurant's items to the restaurant's show page
update seeds to create restaurants
add layout specific to platform on Restaurant#show,create,index
update tests to add items from a specific restaurant
WIP, homepage at rest#index
update homepage to be restaurants#index and update tests accordingly, contact and categories failing currently
implement restaurant slugs
update current_restaurant method
Merge branch 'master' into restaurants
update seeds to make items
put item seeds into restaurant seeds loop
skip tests for multitenant category and contact for now
implement item#title validation scoped to restaurant
Add index to name on restaurants
Add index to items.restaurant_id
Add index to users.email