Remove references to action mailer in config files

This has apparently been deprecated.
Remove scss extensions from CSS files.
Update gems and drop sass-rails.

Sass-rails had some strange dependencies that were preventing updates to
rails that blocked yet other updates. Removing entirely.
Add custom rspec matcher: contain_at_least

This tells you if an array contains all the things in a given array and
does not care if there are more things in there as well.
Make technologies spec actually test /technologies
Handle case where a technology is not found.