Added optional `id` prop to `Collection`, `Grid`, `List`, and `Table`.

Thanks to @mnquintana for the contribution!

Wrapped component `propTypes` with `process.env.NODE_ENV !== 'product…

…ion'` so they can be stripped from production builds.

Thanks to @mbrevda for the suggestion and contribution.

Added `containerStyle` property to `Grid`.

This property allows custom styling to be applied to the inner cell-containing div.
This can be used to enable padding within the grid.
For more context see: github.com/metabase/metabase/pull/3547

Refactored the `detect-element-resize` util to export a factory function.
This allows `AutoSizer` to import it initially but defer execution until mounted.
(Executing immediately causes problems for server-side rendering context.
Using a deferred `require` causes problems for es6 bundlers, eg Rollup.)

Fixed an edge-case that occurred for slower browsers when mounting and then quickly unmounting an `AutoSizer`.
In some cases, an animation event was left attached.
This event is now specifically checked for and removed.
Special thanks to @yb (PR bvaughn#436) for this bugfix contribution.

Replaces references to `getComputedStyle` with `window.getComputedSty…

…le` to better support Enzyme.

Thanks to @DevinClark for the contribution!

Added "module" entry to `package.json` in order to support ES modules…

… with the latest Webpack.

This should enable tree-shaking support ouf of the box for Webpack.
Rollup will continue to use the "jsnext:main" entry to my knowledge.

For more info see https://github.com/dherman/defense-of-dot-js/blob/master/proposal.md
Related issues: webpack/webpack#1979, bvaughn/issues/427

Fixed an invalid export for `IS_SCROLLING_TIMEOUT` inside the `Window…

…Scroller` module.

Changed the embedded `detect-element-resize` library `includes` call …

…to use `indexOf` instead for better IE compatibility.

`scrollToColumn` and `scrollToRow` offsets will always be 0 when `Gri…

…d` size is <= 0.

Technically this is an invalid size but a 0 offset is a more meaningful return value.
Previously the min/max offset check could result in a positive offset in this case (which is invalid).

Fixes bug in resize detector that broke scrollbar functionality in Sa…

…fari.

Fixed a small `Table` alignment issue due to conflicting `padding-rig…

…ht` and `width: 100%` value.

Also fixed an edge-case horiztonal scrollbar that was appearing for some tables.