Create hands-on portion for Unit Testing

[e-schultz]

Not sure how well this could work with our SystemJS setup, or if we'd be better going with a full application setup. What I ended up doing when asked for this was pulling down our angular2-starter and going from there.

Exercise should cover

• [ ] - Creating a service
• [ ] - Setting up mocks/providers
• [ ] - Testing sync behavior
• [ ] - Testing async behavior
• [ ] - Creating a component
• [ ] - Create test scaffolding for component
• [ ] - Have component rely on an injected service
• [ ] - Be able to mock out that service

Connected to #744

[e-schultz]

• would this be a good case to use Angular CLI?
• Should cover RC5 changes to testing

[bennett000]

We might consider adding this to our training examples source code and linking to it from the book. Any thoughts @barretodavid?

[barretodavid]

I think those examples belong to the angular-training-slides (at some point we should rename that repo as angular-training using tags for different versions) as normal Webpack applications.