Merge pull request #21 from rlconley/master

Updated volunteer list rendering works with chronic date parser
Added unconfirm, cancellation, no_show actions to shifts_controller
Volunteers index now sorted by last name, all status update actions working
Merge pull request #22 from curiousepic/master

Other status update actions
walkin form now adds new contact to our db after checking sf
Setup unicorn, etc for Heroku deployment
Merge pull request #23 from curiousepic/master

Setup unicorn, etc for Heroku deployment
fixed merge conflicts