Add Identity Card Number to User

Adds the ~~`id_number`~~ `identity_card_number` attribute and makes it available for the user to edit and see.

~~Need to add censor rules and include it in the initial request email.~~
Hmm, works here…

![screen shot 2014-09-03 at 12 32 53](https://cloud.githubusercontent.com/assets/282788/4133398/0f7958fc-335e-11e4-8d37-5acfcd380015.png)