Save the inspirational images

[bonnieli]

On select of inspirational images on create contest, they actually don't get saved or do anything at the moment. Change the db model and be able to store them.

Suggestion to start an Image model
This model should store the URL (this could be a s3 public url, or any image url) and the date it was created.

1. Manually upload all all the current hardcoded inspo images to s3
2. Write a migration to upload them to your db
3. Load the images on the create contest page with the IDs attached to them
4. Save the selected IDs to the Contest model