Send fulfilment email

Previously, there was no way for the administrator to notify customers
when their order has been fulfilled, which was caugin confusion for the
customers. Created a fulfilled email and a UI to send the email.

https://trello.com/c/KXIyDIIp
Remove footnotes

Previously, the footnotes gem was being used to display additional
information during development, which was turning out to be annoying
more than anything else. Removed the gem from the application.

https://trello.com/c/qLNyMdac
Don't require shoulda matchers

Previously, shoulda-matchers was being required automatically, which is
not advised in the gem's documentation. Stopped the gem from being
required automatically and required it manually in the spec helper.

https://trello.com/c/FRHlRqUl
Remove the sample data rake task

This task is no longer used now that the site is live and uses real data. In
addition to this, it was not tested and must have been written by a
moron