ohad7

//
// Copyright (c) 2015 Nexar Inc. - All Rights Reserved. Proprietary and confidential.
//
// Unauthorized copying of this file, via any medium is strictly prohibited.

import Foundation
import Mixpanel

public class Tweaks : NSObject, MPTweakObserver {
  

mdp

/**
 * Luhn Class is an implementation of the Luhn algorithm that checks validity of a credit card number.
 * 
 * @author <a href="http://www.chriswareham.demon.co.uk/software/Luhn.java">Chris Wareham</a>
 * @version Checks whether a string of digits is a valid credit card number according to the Luhn algorithm. 1. Starting with the second to last digit and
 *           moving left, double the value of all the alternating digits. For any digits that thus become 10 or more, add their digits together. For example,
 *           1111 becomes 2121, while 8763 becomes 7733 (from (1+6)7(1+2)3). 2. Add all these digits together. For example, 1111 becomes 2121, then 2+1+2+1 is
 *           6; while 8763 becomes 7733, then 7+7+3+3 is 20. 3. If the total ends in 0 (put another way, if the total modulus 10 is 0), then the number is valid
 *           according to the Luhn formula, else it is not valid. So, 1111 is not valid (as shown above, it comes out to 6), while 8763 is valid (as shown
 *           above, it comes ou