View food trucks

Resolves parts 1 and 2 of issue #1 
You call `render :new` in both paths so you can pull it out of the `if..else`:

```ruby
if @food_truck.errors.messages[:name][0] == "can't be blank"
  flash.now[:notice] = "Your food truck was not succesfully submitted."
elsif @food_truck.errors.messages[:name][0] == "has already been taken"
  flash.now[:notice] = "This food truck already exists."
end
render :new
```