Charity admins can create dates for pickups

https://trello.com/c/85D0jQu5/2-as-an-admin-i-can-create-and-see-pick-up-dates

![image](https://cloud.githubusercontent.com/assets/8646429/5076285/de736f28-6e67-11e4-93ed-5c72bff4fc26.png)

![image](https://cloud.githubusercontent.com/assets/8646429/5076303/f21dc870-6e67-11e4-8b9b-80f5ba27adc3.png)

Still have the issue with this not being an ivar for the save failing => `render :new` branch below