Update homepage styles
Update mailers; more ui work
Add notifications and move email logic

All of the legwork involving email is happening behind the scenes so it
makes sense to move those methods out of the controller.  With user
notifications the issue was keeping them on a rolling schedule on a per
user basis, which means we need access to the timestamp on the last
notification associated with a particular user.
Change flash message for updating users
Style and cleanup
Add notifications from user model
First go at notifications templates

These need serious work, although at this point it was a priority
to get everything wired correctly.  Planning on eventually having
more bill detail in the notifications, metadata might be a good
option and as a plus there is plenty of it in the sunlight labs
data.
Add draper
Remove footer
Add decorator for party letter
Add whenever
Fix specs
Add cron job for external requests