First support for md extensions; Package all needed dependencies in the repo

Source/node_modules/core-js/modules/es7.math.radians.js

@@ -0,0 +1,9 @@
+// https://rwaldron.github.io/proposal-math-extensions/
+var $export = require('./_export');
+var DEG_PER_RAD = Math.PI / 180;
+
+$export($export.S, 'Math', {
+  radians: function radians(degrees) {
+    return degrees * DEG_PER_RAD;
+  }
+});