A user can create a ticket to distribute inventory to a community partner

[armahillo]

This functionality existed in the previous app (https://github.com/rubyforgood/pdx_diaper/blob/master/app/admin/ticket.rb) so the model methods should be reusable.

There was some discussion about the workflow being different from the donation workflow, so some discussion should be had about how to best do this (cf. #22 and #23 and the discussion from the issue in the previous project: rubyforgood/pdx_diaper#54 )

[danquill]

Completed by #61