Add all the necessary information to the email

The email generated by the contact form now contains all the information required.

Known issues:
- Services must be defined and completed
- There is still no automatic reply to send to us
- There is still no real feedback message to display to the user
- The form will be ajaxified in the end

Signed-off-by: Emanuele Feliziani <feliziani.emanuele@gmail.com>