Add node modules and new code for release (#168)

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

node_modules/underscore/cjs/matcher.js

@@ -0,0 +1,13 @@
+var extendOwn = require('./extendOwn.js');
+var isMatch = require('./isMatch.js');
+
+// Returns a predicate for checking whether an object has a given set of
+// `key:value` pairs.
+function matcher(attrs) {
+  attrs = extendOwn({}, attrs);
+  return function(obj) {
+    return isMatch(obj, attrs);
+  };
+}
+
+module.exports = matcher;