added whole system from ola4doc

sys/node_modules/es5-ext/math/imul/shim.js

@@ -0,0 +1,13 @@
+// Thanks: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
+//         /Global_Objects/Math/imul
+
+'use strict';
+
+module.exports = function (x, y) {
+	var xh  = (x >>> 16) & 0xffff, xl = x & 0xffff
+	  , yh  = (y >>> 16) & 0xffff, yl = y & 0xffff;
+
+	// the shift by 0 fixes the sign on the high part
+	// the final |0 converts the unsigned value into a signed value
+	return ((xl * yl) + (((xh * yl + xl * yh) << 16) >>> 0) | 0);
+};