Registration in Antarcticle without Poulpe

As a User I'd like to be able to Sign Up directly in Antarcticle without going to JC or Poulpe

Acceptance Criteria available for DEV instance

• A Sign Up button/link should appear in the right top corner
• By pressing it, user is redirected to Sign Up page which has URL e.g. qa.jtalks.org/antarcticle/signup (see screenshot).
• Sign Up Page should demand username, password and e-mail
  • Username field should accept from 1 to 25 symbols (space, latin, cyryllic letters, numbers, special characters, ASCII etc.)
    Text of validation message: Username length must be between 1 and 25 characters
  • Username field should accept only values that don't exist
    Text of validation message: User with the username already exists
  • Password field should accept from 1 to 50 symbols (space, latin, cyryllic letters, numbers, special characters, ASCII etc.)
    Text of validation message: Password length must be between 1 and 50 characters
  • Email field validation must be as template mail@mail.ru
    Text of validation message: An email format should be like mail@mail.ru
  • Email field should accept only values that don't exist
    Text of validation message: User with the email already exists.
  • Email field should be less than 50 characters
    Text of validation message: Email field should not contain more than 50 symbols.
• User should get notification message on her email address.
• Notification message should include activation link (e.g. http://http://articles.javatalks.ru/user/activate/44e06d29-9c38-4102-8a9b-b6260a3320d8)
• If user goes through activation link in email message she should be redirected to Antarcticle and should be automatically logged in.
• If user goes through activation link 2nd time, she should be directed to the main page with no messages showed up. She should remain logged out if she was logged out or logged in if she was logged in.
• Text of notification message:
  English

  Dear username!
  This mail is to confirm your registration at Site Name.
  Please follow the link below to activate your account http://articles.javatalks.ru/login
  Best regards,
  Site Name.

NB:

• Tabulation, autocomlete, keyboard buttons using
• Make Honeypots anti-bot for registration form. See JCommune for more details.
• Impossible to drop or damage database using XSS or SQL injections