[#MmLRZ2E2] fix sinon XDomainRequest, clean up CORS request

make sure that Sinon is using FakeXDomainRequest if browser doesn't support CORS, and remove unnecessary parameter from xhr.open call

Branch: MmLRZ2E2-development
[#MmLRZ2E2] remove console logs

IE9 doesn't like console logs

Branch: MmLRZ2E2-development
[#MmLRZ2E2] test iPhone 6 instead of 5

run tests on iPhone 6 (latest) instead of 5 (two previous). The BrowserStack iPhone 5 VM was having issues starting, anyway.

Branch: MmLRZ2E2-development