Adds backbone. Basic shift details are available without refresh
Shift Detail View shows pending and approved employees
Adds cancan backbone
Fixes deny/approve/remove buttons in admin view, not work without refresh
Employees can request shifts and button is toggled, cancel shift button does not yet work
Manager's add/remove requests buttons work
Adds a dialog for creatng a shift, but doesn't work yet
Adds rspec and tests shift model
Adds shifts with jquery
Css
Adds sendgrid
add shift dialog displays only for admin
Fixes incorrect class name