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

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

node_modules/underscore/modules/_shallowProperty.js

@@ -0,0 +1,6 @@
+// Internal helper to generate a function to obtain property `key` from `obj`.
+export default function shallowProperty(key) {
+  return function(obj) {
+    return obj == null ? void 0 : obj[key];
+  };
+}