added new seed file w/ 2 dummy offers x8

A way to fix this
```ruby
Offer.create(
  name: "Free Cup of Starbucks,
  description: "get a free cup of starbucks when...", 
  image: "http://jacksonville.com/sites/default/files/imagecache/superphoto/photos/blogs/86/promo_StarbucksEspresso.jpg", 
  sale_price_cents: 2000, 
  actual_price_cents: 5000
)
```