IE fixes and cleanup
Component cleanup

Adjusts component so that padding/margin can be added around inputs and
they won’t throw off the button positioning.
Hover state adjustments

Adds hovers states for filter input buttons. Adjusts homepage search
button icon color to match inside hover state.
Merge branch 'simplify-filters' of https://github.com/codeforamerica/ohana-web-search into simplify-filters