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
i could be wrong but i believe the signup platform stuff only happens on /signin which is not a marketing website page. can you confirm this with yonatan because if i'm right then we don't need to do any of this.

if you go to /mobile on production and click "sign up" you get taken to /signin.