remove node_modules and .gitignore them

node_modules/es5-ext/math/tanh/shim.js

@@ -1,17 +0,0 @@
-"use strict";
-
-var exp = Math.exp;
-
-module.exports = function (value) {
-	var num1, num2;
-	if (isNaN(value)) return NaN;
-	value = Number(value);
-	if (value === 0) return value;
-	if (value === Infinity) return 1;
-	if (value === -Infinity) return -1;
-	num1 = exp(value);
-	if (num1 === Infinity) return 1;
-	num2 = exp(-value);
-	if (num2 === Infinity) return -1;
-	return (num1 - num2) / (num1 + num2);
-};