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
@kylerush yes I found it in the create_account dialog code https://github.com/optimizely/optimizely/blob/4720d425f3fabd47a1b8a373002dd4a83b1d29ae/src/www/js/bundle/dialogs/create_account.js#L97.

The function gets run in the handle success method.  Nobody told me it was necessary but I put it in for good measure.  Who would be the best to talk to and see if it's necessary?