Ruby on Rails Development

We have a part developed Ruby on Rails site at: [login to view URL] We are wanting someone to complete the development of this application. Specifically: * Change current response to successful sign-up action to send notification email and display a simple confirmation message instead of displaying the user details / links. * Add 'approved / unapproved' flag to each user record (defaults to unapproved on registration) and add tests to user login to disallow login until approved. * On user sign-in, test against approval status and act accordingly. (only approved users may sign in) * On user sign-up, check database for existing email address. Do not allow duplicates * Add validation to sign-up form. All fields are required * Error messages on user sign-in need to be changed to more friendly text * Add new page containing terms and conditions of use * Add link to T&C page to top menu (?) * Force user to agree to terms before downloading any file (pop up alert) * Change top menu link (currently points to 'add category') to point at the 'add subcategory page' * Disable access to all administration functions to non-admin users: (User Management, Sub-Category Management, File Management) * Disable access to browsing categories / subcategories to guest browsers (i.e. users not logged in) Coders about 9.5 rating only please. We can provide files and database schema.