question options can berequired, all tests passing
required error as flash message

idem
Merge branch 'master' into required
back link after validation fixed
and a broken test
using a default value for radio buttons
since when none selected, they aren't included in params
so no model is selected nor are validations triggered
http://stackoverflow.com/questions/8967795/is-there-a-way-to-define-a-default-value-to-be-selected-in-an-html-form-of-radio