Recoded Fishbans for new OO model

- Ban#to_s now returns a String instead of puts-ing it
- Service#to_s works now
- Removed Fishbans#get_stats and Fishbans#get_stats_for_service
- Fishbans#get_player and Fishbans#get_skin_for_player now take the
optional args 'part' and 'resolution' instead of a hash of options
- Added Fishbans#get_uuid_for_player
- Fishbans#get_block now returns a Block object
- Fishbans#get_skin_for_player now returns a Skin object
- Fishbans#get_player no longer makes any API calls, instead, it calls
functions that make API calls
- Added success checks for all functions that make API calls
- Fishbans#get_player now returns a fully-functional Player object
- Removed Fishbans#get_bans_for_player (use
Fishbans#get_service_for_player instead)
- Removed all private methods in Fishbans
- Runner is really derpy right now because I pretty much removed all of
its functionality so I could test the new Fishbans