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

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

node_modules/underscore/modules/matcher.js

@@ -0,0 +1,11 @@
+import extendOwn from './extendOwn.js';
+import isMatch from './isMatch.js';
+
+// Returns a predicate for checking whether an object has a given set of
+// `key:value` pairs.
+export default function matcher(attrs) {
+  attrs = extendOwn({}, attrs);
+  return function(obj) {
+    return isMatch(obj, attrs);
+  };
+}