Added order#destroy and adjust account balance on destroy
only allow delete of future orders after cutoff_date
Merge pull request #91 from kheang/master

Restrict deletion of orders to only future orders
Added money-rails gem; saving $ as cents, display $ as dollars with _dollars suffix
Merge pull request #92 from kheang/master

Added money-rails gem; saving $ as cents, display $ as dollars with _dol...
lunch coverage, 1st step: returning days of the week for which lunch has been ordered