Email spec

Here's my modified registration spec. I pretty much copied a lot of the stuff in that example you gave me. Thanks!

I'm still having problems when running `rspec` instead of `bundle exec rspec`. Let me know if you have any tips on that, or just respond to my [stack overflow question](http://stackoverflow.com/questions/27432435/how-to-resolve-a-gem-dependency-conflict-after-installing-email-spec).