Initial 9.0.0 RC

Better guard against minification/uglification in ColumnSizer when ve…

…rifying child is either a Grid or a MultiGrid. (resolves bvaughn#558)

* Adding missing scrollToRow method to List and Table (as pass-thrus …

…for Grid.scrollToCell).

* Bugfixes with MultiGrid resize handling and caching.
* List checks it row-style object has been frozen before modifying width; (fix for upcoming React 16 change).
* MultiGrid better handles case where rowCount === fixedRowCount

Added MultiGrid method measureAllCells; deprecated misnamed measureAl…

…lRows method.

Fixed regression in WindowScroller when browser is resized.

* 🐛 Minor Preact compat fix to element resize detector; see preactjs/…

…preact-compat/issues/228

* 🎉 New scrollToCell public method added to Grid.

* 🎉 WindowScroller supports custom target element via a new scrollEle…

…ment prop; defaults to window for backwards compatibility.

* 🐛 MultiGrid supports onScroll property.
* 🎉 New id-based CellMeasurer cell size cache, idCellMeasurerCellSizeCache.

* New MultiGrid reduces the boilerplate required to configure a Grid …

…with fixed columns and/or rows.

* defaultTableRowRenderer passes new rowData param to event handlers (in addition to index).
* 🐛 Styles are no longer cached while scrolling for compressed lists (@nickclaw - bvaughn#527)
* 🐛 Cell cache is reset once InfiniteLoader load completes (@nickclaw - bvaughn#528)
* Add loose-envify support for Browserify users (@chrisvasz - bvaughn#519, bvaughn#523)
* dom-helpers dependency relaxed to support 2.x and 3.x versions (@danez - bvaughn#522)
* 🐛 Collection no longer drops its overflow style in certain conditions; see facebook/react/issues/8689 for more info.

Fixed a bug with `Grid` style-cache that caused stale cell-sizes to b…

…e used when `Grid` resized.

Grid now temporarily caches inline style objects to avoid causing sha…

…llow compare to fail unnecessarily (see PR bvaughn#506).

AutoSizer internal detectElementResize library now no longer creates duplicate <style> tags when unmounted and remounted (see PR bvaughn#507).