wip, waiting for pry
add carrierwave gem
Generate uploader

- ran 'rails g uploader image'
add image column to saddles table
Add image uploading to saddle

- use Carrierwave
- test with js using Capybara's attach file
- allow image as a saddle param
- add fixtures and a test image
- show saddle image in view
- ignore public/uploads - this is where Carrierwave stores uploaded
  images
Refactor steps