Bug fix: our prod mail server doesn't like messages comfing
from info@perma.cc. Requiring the user to enter their email now.
This makes sense anyway.
Fixed a couple of failing feedback form tests.
Added error message if feedback form is submitted without email.
Fixes #608
Merge branch 'develop' of github.com:harvard-lil/perma into develop
Fix IE archive creation; improve Sauce tests.
Merge branch 'dev-sauce' of https://github.com/jcushman/perma into jcushman-dev-sauce
Merge branch 'jcushman-dev-sauce' into develop