Minor cleanups

- Fix line length violations
- Add JavaDoc to some longer methods
- Remove unused imports

src/main/java/fr/xephi/authme/process/join/AsynchronousJoin.java

@@ -20,7 +20,6 @@ import fr.xephi.authme.settings.properties.RegistrationSettings;
 import fr.xephi.authme.settings.properties.RestrictionSettings;
 import fr.xephi.authme.util.PlayerUtils;
 import org.bukkit.GameMode;
-import org.bukkit.Location;
 import org.bukkit.Server;
 import org.bukkit.entity.Player;
 import org.bukkit.potion.PotionEffect;