Provides simple importing for Firm CSVs

Currently imports the whole firm CSV without regard for
statuses or any other business rules.

This will fail entirely if it encounters an issue with the
CSV. This could be encoding, or quoting or just a general
snafu. This is to be expected at least for now.
I think it's better to add the attr_* definition on the top of the class rather than on the bottom. Wdyt?