Add node modules and compiled JavaScript from main (#54)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/underscore/modules/isElement.js

@@ -0,0 +1,4 @@
+// Is a given value a DOM element?
+export default function isElement(obj) {
+  return !!(obj && obj.nodeType === 1);
+}