merge into master

source/HelperFunctions.hx

@@ -1,3 +1,5 @@
+import flixel.math.FlxMath;
+
 class HelperFunctions
 {
     public static function truncateFloat( number : Float, precision : Int): Float {
@@ -6,4 +8,8 @@ class HelperFunctions
 		num = Math.round( num ) / Math.pow(10, precision);
 		return num;
 	}
+
+	public static function GCD(a, b) {
+		return b == 0 ? FlxMath.absInt(a) : GCD(b, a % b);
+	}
 }