Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/underscore/amd/_getLength.js

@@ -0,0 +1,8 @@
+define(['./_shallowProperty'], function (_shallowProperty) {
+
+	// Internal helper to obtain the `length` property of an object.
+	var getLength = _shallowProperty('length');
+
+	return getLength;
+
+});