✨ Better aria roles set for `Table` column cells and headers. (@jchen527 - https://github.com/bvaughn/react-virtualized/pull/681)

🐛 `CellMeasurer` restores `width` and `height` `style` values after measuring to avoid edge-case layout bugs. (@marcelmokos - https://github.com/bvaughn/react-virtualized/pull/675)
