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

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

node_modules/underscore/modules/_isArrayLike.js

@@ -0,0 +1,8 @@
+import createSizePropertyCheck from './_createSizePropertyCheck.js';
+import getLength from './_getLength.js';
+
+// Internal helper for collection methods to determine whether a collection
+// should be iterated as an array or as an object.
+// Related: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
+// Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
+export default createSizePropertyCheck(getLength);