Finalized some fields, removed redundant code, various other fixes

src/main/java/fr/xephi/authme/cache/limbo/LimboCache.java

@@ -19,9 +19,9 @@ import java.util.concurrent.ConcurrentHashMap;
 public class LimboCache {
 
     private volatile static LimboCache singleton;
-    public ConcurrentHashMap<String, LimboPlayer> cache;
-    public AuthMe plugin;
-    private JsonCache playerData;
+    public final ConcurrentHashMap<String, LimboPlayer> cache;
+    public final AuthMe plugin;
+    private final JsonCache playerData;
 
     /**
      * Constructor for LimboCache.

src/main/java/fr/xephi/authme/cache/limbo/LimboPlayer.java

@@ -8,7 +8,7 @@ import org.bukkit.scheduler.BukkitTask;
  */
 public class LimboPlayer {
 
-    private String name;
+    private final String name;
     private Location loc = null;
     private BukkitTask timeoutTaskId = null;
     private BukkitTask messageTaskId = null;