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

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

node_modules/underscore/amd/indexOf.js

@@ -0,0 +1,11 @@
+define(['./sortedIndex', './findIndex', './_createIndexFinder'], function (sortedIndex, findIndex, _createIndexFinder) {
+
+	// Return the position of the first occurrence of an item in an array,
+	// or -1 if the item is not included in the array.
+	// If the array is large and already in sort order, pass `true`
+	// for **isSorted** to use binary search.
+	var indexOf = _createIndexFinder(1, findIndex, sortedIndex);
+
+	return indexOf;
+
+});