See you later, Ember Data.

I'm sure Ember Data will in time become a fantastic library.  However,
presently, I've lost quite a bit of time in making persistence work with
the following (simple) scenario:

   EventSearch - 0..* --- 0..* - DataCollector

Similar multiplicities apply for EventType and StudyLocation.

The frustrating thing is that data _does_ reach the server; I just have
problems with the record lifecycle (see previous commit).  But even with
transaction micromanagement (i.e. adding all dirty records to a
transaction), I keep hitting those lifecycle errors.

Doubly frustrating: I can get this sort of thing to work in a test app,
but not here; the bad interaction is quite elusive.

I therefore have to conclude that Ember Data is indeed not production
ready in the most severe sense.  We'll check in next year.