Accept Strings as inputs instead of UUIDs.

This leaves options for other plugins to hook into us to use our vault operations. I did a first shot of this with FactionsUUID.
* This needs to be tested more in depth before being pushed to a release version as it changes how we handle a lot of our dupe checks.

src/main/java/com/drtshock/playervaults/vaultmanagement/EconomyOperations.java

@@ -47,7 +47,7 @@ public class EconomyOperations {
             return true;
         }
 
-        if (!UUIDVaultManager.getInstance().vaultExists(player.getUniqueId(), number)) {
+        if (!UUIDVaultManager.getInstance().vaultExists(player.getUniqueId().toString(), number)) {
             return payToCreate(player);
         } else {
             double cost = BUKKIT_CONFIG.getDouble("economy.cost-to-open", 10);