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
is this something that you copied from the product code? i don't think it's necessary as none of the marketing website functions (sign in, create account, create experiment) require a csrf toke and it's especially not necessary to do this if we are reloading the web page after a successful sign in/account creation because titan injects the csrf token into the html.