Added all-cascade-delete to has-many relationships

In particular, to the many Fundraisers, FundingTiers, and Donors.
Merge branch 'FundingTiers' of https://github.com/jried31/MAPRJ into FundingTiers
Bugfix, solves redirection issues when donating.

Relying on a variable which may or may not have been defined
depending on the specific page was causing invalid links to
be created for donate buttons.  This has been fixed.