Added SteamGame.uptodate? to check games just using the AppID
Added SteamGame.uptodate? to check games just using the AppID

SteamGame#uptodate? will now just call this instead

hcool/steam-condenser-ruby,koraktor/steam-condenser-ruby,Arie/steam-condenser-ruby,jpalumickas/steam-condenser-ruby,bfosberry/steam-condenser-ruby,kickback/steam-condenser-ruby