Test finding dates.

Finding one record with a date works. findAll does not load the dates.
Do not normalize twice.

The individual records in an array were being normalized in
extractSingle, then normalized again in extractArray. #normalize is not
idempotent and the second normalization caused previously deserialized
dates to be set to null.
When this test is enabled, the runner loops forever.

I don't know why, but since its pending anyway it doesn't seem worth
investigating right now.
Ensure that dates (etc.) in associations are deserialized.
Merge pull request #18 from humanpractice/find_all_dates

Date attributes were set to null with findAll
Use configured relationship names.

The convention for relationship names is to use the plural version of the name
of the model they contain. But ember-data does not require this and neither
should this adapter.