Add Colored string to the alias, remove Double, use double

src/main/java/com/onarandombox/MultiverseCore/MVWorld.java

@@ -51,8 +51,8 @@ public class MVWorld implements MultiverseWorld {
 
     private Map<String, List<String>> masterList;
 
-    private Double scaling; // How stretched/compressed distances are
-    private Double price; // How much does it cost to enter this world
+    private double scaling; // How stretched/compressed distances are
+    private double price; // How much does it cost to enter this world
     private int currency = -1; // What is the currency
     private boolean hunger = true;
     private Permission permission;

src/main/java/com/onarandombox/MultiverseCore/api/MultiverseWorld.java

@@ -135,6 +135,15 @@ public interface MultiverseWorld {
      */
     public ChatColor getColor();
 
+    /**
+     * Tells you if someone entered a valid color.
+     *
+     * @param color A string that may translate to a color.
+     *
+     * @return True if it is a color, false if not.
+     */
+    public boolean isValidAliasColor(String color);
+
     /**
      * Returns a very nicely colored string (using Alias and Color if they are set).
      *