Set site-wide 'from' address

Config/initializers/devise.rb sets this for devise, but not for mailers.
https://www.pivotaltracker.com/story/show/41278297
Email volunteers when they volunteer

https://www.pivotaltracker.com/s/projects/608983
Merge branch 'master' of https://github.com/railsbridge/bridge_troll into rsvp-confirmation-mailer
Add db:test:prepare to script/bootstrap
Refactor user controller
Totals at top of check in page should update as volunteers are checked in
Merge branch 'rsvp-confirmation-mailer' of https://github.com/k-stewart/bridge_troll into k-stewart-rsvp-confirmation-mailer
Merge branch 'chores/refactor-users-controller' of https://github.com/squanto/bridge_troll into squanto-chores/refactor-users-controller
Merge branch 'check-in-totals' of https://github.com/treble37/bridge_troll into treble37-check-in-totals
Restored ajaxyness of Check In buttons.

Check In / Un-Check In buttons update totals ajaxilly.
show volunteer childcare requests in organizer console
Only send confirmation email to volunteers

https://www.pivotaltracker.com/story/show/41278297
Rsvp mailer: Refactor volunteer_confirmation

per tjgrathwell's comments in
https://github.com/railsbridge/bridge_troll/pull/143
Add some detail about using MailCatcher for email
Add some detail about using MailCatcher for email
Rsvp mailer: render the body

I was using some fancy footwork to send confirmations only to
volunteers, and that interfered with Rails' default mailer template
nomenclature.  Pointed the mailer to the right template, added some
tests to catch this in the future. Added location to the event
factory to enable tests.
Merge branch 'rsvp-confirmation-mailer' of https://github.com/k-stewart/bridge_troll into k-stewart-rsvp-confirmation-mailer
Improve confirmation email template
Use HTTPS rubygems
Merge pull request #146 from fionatay/https_rubygems

Use HTTPS rubygems