put shifts in coop for routing
only admin can create recurring meals and shifts in coop. begin making html forms for meal/shift creation
form for creating meals
form to add meals with shifts to coop
begin working on meal and shift creation from meal form
meals are created via new form system. join table in preparation for creating the associated shifts
shifts are created for new meals. existing shifts are updated to refer to the new meals. if meal no longer occurs on a day, its shifts are destroyed.
Merge branch 'master' of https://github.com/daf-/coop-site into admin-creates-all-shifts

Conflicts:
	app/views/coops/show.html.erb
Merge pull request #14 from daf-/admin-creates-all-shifts

Admin creates all shifts