Added smarter_csv

Using this gem for now as it does smarter chunking of large files, plus
background processing using Resque.
Added email sequence

Borrowed the one from SCS
Added phoenix_id as a surrogate
WIP people import form CSV

Initial refactored CSV importer from spike. Needs more tests around
person creation/updating plus support for Resque.
Added a Phoenix id as the surrogate key

Added a surrogate ID that we can match to the import
Refactored the CSV importer

Removed any comply with Resque or any other background processor.
The load method now accepts a block and yields a chunk which is an
array of hashes containing the relevant rows.