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
this will soon be unnecessary once the body error class feature is added to form today.

after that you can just do this:

```js
.on('validationerror', w.optly.mrkt.Oform.validationError)
```