Added support for the Fishbans stats API

- Made all those repetitive public methods in Fishbans use process() to
remove the redundancy
- Made option parsing more strict
- Fixed a bug where print_bans and print_bans_for_service didn't return
correctly
- Changed "#{service}" to service
- Runner now is more dynamic
- Updated readme
Fixed untracked files
Updated readme

Updated the Windows binary download link so that I'll never have to
again
Also, .gem files are now ignored (so they'll never pop up in the future)