Add node modules and compiled JavaScript from main (#172)

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

node_modules/underscore/cjs/isWeakMap.js

@@ -0,0 +1,7 @@
+var _tagTester = require('./_tagTester.js');
+var _stringTagBug = require('./_stringTagBug.js');
+var _methodFingerprint = require('./_methodFingerprint.js');
+
+var isWeakMap = _stringTagBug.isIE11 ? _methodFingerprint.ie11fingerprint(_methodFingerprint.weakMapMethods) : _tagTester('WeakMap');
+
+module.exports = isWeakMap;