School now optional
N/A placeholder on district field and don't save it if it's n/a
Updating required field error UI a bit, and there is some larger
refactoring needed here later.
NCES phone number for district only entries will currently be a child
school, will fix later.
Closes#3818
* Tweak wording, options
* Instead of storing changes in local storage, warn when users may lose changes by navigating away
* Fix CreateTeacherAccountView so that if you connect to an existing account, the redirect is triggered
* Fix users.coffee weird race condition
