Change log level to 'info' in prod env (#181)
Change log level to 'info' in prod env (#181)

**WHY**: `debug` is the most verbose level of logging and includes SQL
logs, which was resulting in logging of our `encrypted_ssn_in`, which is
a potential security risk.

With `info`, the second most verbose level, there is no SQL logging. It
is also the default for production in Rails, so that seems like a good
place to go.

Reference:
* http://guides.rubyonrails.org/v3.2/debugging_rails_applications.html#log-levels
codeforamerica/michigan-benefits,codeforamerica/michigan-benefits,codeforamerica/michigan-benefits,codeforamerica/michigan-benefits