rename Action to Event
destroy events
CRUD for volunteers
add event sign-up to a volunteer
destroy sign-ups if an event or volunteer are destroyed
link to events/vols from vol/event show page
display number of vols and events
display all volunteers on home page
use route helpers on application layout
create new organizers
allow organizers to log in
allow organizers to log out
automatically log in a new organizer
require authorization for restricted actions
test sign-in process
test organizer sign out process
test new event creation
test updating an event