So that in forms you don't have to find the equality for each option. Instead,
just set the select value and, afterRender, call updateSelects, the options that
matches the value will become selected.
* If logged in => repopulate and lock email (and name if available)
* If logged out => disallow using an email for an existing account and display a validation message + login link
* formToObject handles checkboxes and radio buttons
* applyErrorsToForms handles required fields
* setErrorToField sets helpblock according to new forms best practices: before input and any help blocks
