spiderOakApp.initialize() is not necessary in this test.
Restore the original alternateAjax setting, so the change is transient,
doesn't mess with other tests!
Cosmetic - spiderOakApp is available directly in the top level namespace.
Whoops - apply sync from the right kind of backbone object (even though
the same underlying sync is probably being used).
Make our spiderOakApp.ajax function useable, with the default $.ajax
function even before the settings object is established.
Repair basicAuthManager.resumeAccountBasicAuth() - set currentAuthString
as a local variable. It's not an object member.

Also, implement a test to verify that removing the password cancels
access to the object.  The kind of thing that the above error would
fail, until rectified.