Vagrant back to vboxfs

Changing back to vboxfs since I couldn't get it to install as an SMB
share.
Replace hardcoded data in prereg messages

Dynamic event and prereg open dates, plus a fix for events without
years.
Reverting prereg_takedown value

I had messed with prereg_takedown for testing, forgot to put it back.
Merge pull request #306 from magfest/bugfix_reg_check

Bugfix reg check