Switch to pry-byebug for ruby 2.1.2.
Whitelist registration process by email.
Views to manage the email whitelist.
Merge pull request #34 from troygnichols/14_email_whitelist

email whitelist
Delete 20140819202142_create_registration_whitelists.rb

Remove duplicate migration stub.
Update registration spec
Bootstrap 3 and UI improvements
Remove unused javascript
Cleanup sign-in page and styling