docs(guide,tutorial): fix outdated Protractor API link

Link to the gh-pages deployment of protractor docs, it's much easier on the eyes.

Closes #9946

Author: AdirAmsalem

docs/content/guide/e2e-testing.ngdoc

@@ -27,8 +27,8 @@ Protractor is a [Node.js](http://nodejs.org) program, and runs end to end tests
 written in JavaScript and run with node. Protractor uses [WebDriver](https://code.google.com/p/selenium/wiki/GettingStarted)
 to control browsers and simulate user actions.
 
-For more information on Protractor, view [getting started](https://github.com/angular/protractor/blob/master/docs/getting-started.md)
-or the [api docs](https://github.com/angular/protractor/blob/master/docs/api.md).
+For more information on Protractor, view [getting started](http://angular.github.io/protractor/#/getting-started)
+or the [api docs](http://angular.github.io/protractor/#/api).
 
 Protractor uses [Jasmine](http://jasmine.github.io/1.3/introduction.html) for its test syntax.
 As in unit testing, a test file is comprised of one or

docs/content/tutorial/step_03.ngdoc

@@ -120,7 +120,7 @@ really is that easy to set up any functional, readable, end-to-end test.
 ### Running End to End Tests with Protractor
 Even though the syntax of this test looks very much like our controller unit test written with
 Jasmine, the end-to-end test uses APIs of [Protractor](https://github.com/angular/protractor). Read
-about the Protractor APIs at https://github.com/angular/protractor/blob/master/docs/api.md.
+about the Protractor APIs at http://angular.github.io/protractor/#/api.
 
 Much like Karma is the test runner for unit tests, we use Protractor to run end-to-end tests.
 Try it with `npm run protractor`. End-to-end tests are slow, so unlike with unit tests, Protractor

docs/content/tutorial/step_08.ngdoc

@@ -184,7 +184,7 @@ You can now rerun `npm run protractor` to see the tests run.
 
 # Experiments
 
-* Using the [Protractor API](https://github.com/angular/protractor/blob/master/docs/api.md),
+* Using the [Protractor API](http://angular.github.io/protractor/#/api),
 write a test that verifies that we display 4 thumbnail images on the Nexus S details page.