redding/mr — pull request #31 by kellyredding (2013-06-08 21:04:30+00:00)
Title: have the `FakeRecord` mimic ARs `column_names`

AR exposes its columns using the class reader `column_names`. This
mimics the behavior of that reader in MR fake records.

It uses the configured `attributes` as the source for the column
names, where a real AR record would use the data schema.

@jcredding ready for review.