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
do you need this anonymous function? can't you just do this:

```
signupForm.on('validationerror', w.optly.mrkt.Oform.validationError);
```