Fix current npm broken. Remove babel-polyfill import

[bySabi]

Hi @dennybritz

Current npm 0.2.4 is broken. This PR fix that.

I changed Object.assign to jQuery.extend. Now is more IE9 and mobile compliant without babel-polyfill dependencies.

[dennybritz]

I don't understand, why is it broken? I'd really not rely on jQuery.

[bySabi]

Cause this line: https://github.com/dennybritz/neal-react/blob/master/js/app.js#L1 it broke if babel-polyfill npm is unmet. Adding the whole polyfill only for Object.assign IMO is not adecuate.

This package already use jQuery: https://github.com/dennybritz/neal-react/blob/master/js/components/vendor/stripe.jsx#L14. jQuery is needed for Bootstrap 4 module.

[bySabi]

Hi @dennybritz do you already see the problem?

[dennybritz]

I decided to keep babel-polyfill in. It's true that it's currently not used beyond Object.assign but I think it may be useful in the future when adding new features. I moved it back into the dependencies.

I'd love to get rid of the jQuery dependency someday. Not everyone needs the Bootstrap Javascript.