Add: first ajax test
Add: Test from Listing 12.13
Add: Test for get method and get method (Listing 12.14)
Add: ajaxCreate stub (Listing 12.16)
Rep: Stub from Listing 12.16 with Sinon.stub
Add: open stub from Listing 12.13
Add: stub improvement (Listing 12.26)
Rem: Merge conflict