mailer for issued gift cards

Change-Id: Ifd9264b158774cf8967f043373f3ecabcdc1b8c8
send email when an admin creates a gift card

Change-Id: Id80ea2483fcb34d230f8008da6a56cddc7a01392
Merge remote-tracking branch 'upstream/2-1-lav' into 2-1-lav
Merge pull request #4 from seantaylor/2-1-lav

Add in Mailer for gift cards issued
Add a button to void gift cards.
Add a restore button in place of the void button.

When current value == 0.