Email req

[jalena-penaligon]

@hsmitha26 / @erin-king / @stiehlrod

Closes User Story 9 (#114)
"As a visitor
When I visit the user registration page
If I fill out the registration form
But include an email address already in the system
Then I am returned to the registration page
My details are not saved and I am not logged in
The form is filled in with all previous data except the email field and password fields
I see a flash message telling me the email address is already in use"

• Created feature test for duplicate email submission
• Updated form to pass a nil value for email
• Updated form to display all error messages
• All user registration tests passing

[erin-king]

Brilliant!