use a robust, easy to style select component

[enjalot]

this component should be much more complete than what I hacked together https://jedwatson.github.io/react-select/

[hydrosquall]

I haven't done a head-to-head comparison, but I've also heard good things about Kent C. Dodds' https://github.com/paypal/downshift

[micahstubbs]

nice. I've got an open mind about how we implement this, I just want something more robust and easier to style than our current mix of custom dropdowns and browser default select elements