Taha rest controller challenge

@ltw had an issue with one of the tests for this one. it says the delete test is not passing but I am able to delete customers... also, would like to know that i'm adhering to rest and crud conventions. thanks
you're doing this contact lookup quite a bit. you could refactor this into a method:
```ruby
helpers do
  def contact
    @contact ||= Contact.find(params[:id])
  end
end
```
Then you can just use `contact` in the view and controller actions.