Added test for fast subsequent saves using odata service

Hi
Regarding the issue explained at stackoverflow 
http://stackoverflow.com/questions/27106389/multiple-fast-saves-on-the-same-entity-with-breeze# I added a test case issuing two fast subsequent saves using an oData service and the save queuing feature.
Just hit run and the test will be executed. The code is modifying a property twice but only one request is made to the server. When attaching the debugger you may see that you only get one call.
Note:  the tests succeeds every second time, this is due to the implementation of the odata service.
Thanks for your help.