Scaffold Modifications

1. Create a Rails project named PetSalon.

2. Create a Rails scaffold with model Pet and these fields:

                     Rails
      Field          Datatype 
      ===========    ========
      pet_name       string
      animal_type    string
      owner_name     string
      weight         float
      birth_date     date
      photo          string
      is_neutered    boolean
      is_vaccinated  boolean
      comments       text

3. Add validations to make sure that 
   a. pet_name and animal_type are not empty.
   b. weight is numeric.

4. Modify the index view so that only pet_name, animal_type, and owner_name
   appear on that view. 

5. Modify the layout so that the image pets-r-us.jpg appears at the top
   of each page.

6. Add an h1 header at the top of the show page.

7. Modify the input form so that the field names are capitalized with
   no underscore characters.

8. Change the year dropdown menu for birth_date year so that is displays
   years from 20 years ago up until the present year.

9. Put this line at the bottom of the index page:
   The total number of pets in our database is ??.
   (?? is replaced by the actual number of pets.)

10. Instead of showing the name of the image file (image_name), show the
    actual image on the show view instead.  You may assume that all of the
    possible pet images to show have already been copied into the
    assets/images folder.