added signup view
added link to sign up
create user
send email to activate account
validate if user exists
single URI authorization
validate email when create user
Update signup.ejs
use bewit to sign up
updated sign in and sign up
updated css href
updated user exists validation on forgot
updated signin, signup and forgot links
enable and disable signup feature
updated document to explain how to add fields to sign up form
updated footer
updated readme images
Merge pull request #8 from auth0/signup

Signup