Generated hopeful mailer
Added subscription status to Hopeful

Hopefuls now have a subscription status, which is set to true by
default. Now hopefuls can unsubscribe, but we can retain their
information for future campaigns: "Let us know why you unsubscribed."
Fixed development mailcatcher configuration
Added basic mailer for unsubscribe/resubscribe

The HopefulMailer provides a template for a simple email communication
upon registration or unsubscription from the site.
Updated Hopeful model to be aware of HopefulMailer

The Hopeful model now knows to send email upon registration and
unsubscription.
Added controller function for unsub/resub requests

The controller can now route appropriately for unsubscription and
resubscription requests. In addition, the languages file now has entries
for those states.
Added helper for Hopeful sub/unsub externalization
Merge pull request #7 from YoPro/feature/bem-implemement-hopefuls-mailer

Feature/bem implemement hopefuls mailer