Removed redundant buttons, as the single link allos users to both sign-up and sign-in.
Removed the calculationpage layout in favor of the calculation fragment.
I moved the javascript previously in the calculation page layout (and the fragment) into the app/assets/javascript/calculation.js
Removed the calculation.js.coffee script, as we are not using it, and I think at this point, the coffeeScript is likely to be more confusing than the javascript.
Hopefully, I got everything put back together correctly; Let me know if something doesn't work.