Campaign - Overview tab
Acts similar to the program overview page, except built in pure Rails forms
Organizers can associate a "templated" course in the details form. This will initially simply be an input field to enter the slug of the template course (so not full preview like in the wireframe). In a later version, a "Create course template" button might be shown, that will go to the course creator and automatically associate it to the campaign as the designated template
For now not including the concept of templated programs.
Organizers can also add/remove CampaignsUsers in the Details, similar to how facilitators and courses
A campaign doesn't have times, just dates.
Force validate the dates -- the end date is always later than the beginning.
The dates follow Y/M/D.