Improve registration process

[walkasjesus]

Currently this has some limitations:

• Extend form with email, firstname, lastname, gender, terms ans conditions
• email confirmation
• email notification to moderator that a user is registered

This registration form is perfect by example: http://demo.viewflow.io/materialforms/registration/

I already tested a little bit with the https://materializecss.com, and that seems to work.

[walkasjesus]

Must have Extend form with email, firstname, lastname, gender, terms ans conditions is done. The rest is future