Mobile ui (#227)

* Basic grid setup

* Fixing thumb on two-up

* Adding margin so you can still access the two-up

* Allow multi-panel to keep one open only

* Edge cases for one-open

* Abstracting results so it can be used as a heading.

* Ordering of items in mobile view. Changing scrolling element.

* Adding labels to collapsed view

* Adding height animation to multi-panel

* Fixing animation bugs

* Expand/collapse icon

* Allow two-up and pinch-zoom to work beneath controls

* Range bubble now behaves properly on mobile

* No longer need this.

* Prevent options overflow at larger widths

src/components/expander/style.scss

@@ -1,7 +1,3 @@
-.expander {
-  transition: height 200ms ease-in-out;
-}
-
 .children-exiting {
   & > * {
     pointer-events: none;