RFR - Add photos to Database

It will seed most of the database with photos. 
You don't actually want to hard-code IDs in here, because the IDs for the Pokemon may not in fact be 1 through 778.  If, for example, I delete all my characters in the console (`Character.delete_all`) and then re-run `rake db:seed`, it'll start at ID 779.

Instead, you can grab all the characters and iterate over them:

```ruby
Character.all.each do |char|
  query = Net::HTTP.get("pokeapi.co", "/api/v1/sprite/#{char.id}/")
  # ...
  char.photo = "pokeapi.co#{pokemon["image"]}"
  char.save
end
```