Fix NoClassDefFoundError being thrown on enable when Vault isn't loaded.

src/main/java/com/massivecraft/factions/P.java

@@ -117,8 +117,12 @@ public class P extends MPlugin {
     }
 
     private boolean setupPermissions() {
+        try {
         	RegisteredServiceProvider<Permission> rsp = getServer().getServicesManager().getRegistration(Permission.class);
         	perms = rsp.getProvider();
+        } catch (NoClassDefFoundError ex) {
+        	return false;
+        }
         return perms != null;
     }