add prettier and eslint

spec/performance/performance_test.js

@@ -1,9 +1,9 @@
-describe("performance", function() {
+describe('performance', function() {
   for (var i = 0; i < 10000; i++) {
-    it("should pass", function() {
+    it('should pass', function() {
       expect(true).toBe(true);
     });
-    it("should fail", function() {
+    it('should fail', function() {
       expect(true).toBe(false);
     });
   }