remove node_modules and .gitignore them

node_modules/es5-ext/math/sign/implement.js

@@ -1,10 +0,0 @@
-"use strict";
-
-if (!require("./is-implemented")()) {
-	Object.defineProperty(Math, "sign", {
-		value: require("./shim"),
-		configurable: true,
-		enumerable: false,
-		writable: true
-	});
-}

node_modules/es5-ext/math/sign/index.js

@@ -1,3 +0,0 @@
-"use strict";
-
-module.exports = require("./is-implemented")() ? Math.sign : require("./shim");

node_modules/es5-ext/math/sign/is-implemented.js

@@ -1,7 +0,0 @@
-"use strict";
-
-module.exports = function () {
-	var sign = Math.sign;
-	if (typeof sign !== "function") return false;
-	return sign(10) === 1 && sign(-20) === -1;
-};

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

@@ -1,7 +0,0 @@
-"use strict";
-
-module.exports = function (value) {
-	value = Number(value);
-	if (isNaN(value) || value === 0) return value;
-	return value > 0 ? 1 : -1;
-};