Replace grunt with npm scripts

test/setup.js

@@ -0,0 +1,9 @@
+'use strict';
+
+require('co-mocha')(require('mocha')); // monkey patch mocha for generators
+
+const expect = require('chai').expect;
+const sinon = require('sinon');
+
+global.expect = expect;
+global.sinon = sinon;