Dfoxpowell/modal oform signin signup

- Implement oform on signup/signin modals
- move oform globals to global js because it was not getting included before it was called in modal component JS --- Need Browserify!!!
- log response from signup to segment
- styling for error classes in helpers and modal scss
does the product app do this? i think it is possible for users who created accounts before we enforced strong passwords to still have weak passwords that won't pass this validation. i actually don't think we should validate the password or email on the sign in form at all.