Added defaultHeight and defaultWidth properties to AutoSizer for SSR

Masonry component now properly pre-renders as specified by overscanBy…

…Pixels

* 🐛 List and Grid scroll snapping / resetting bugfix bvaughn#823 by @…

…TrySound

* 🐛 MultiGrid crash due to scrollTo* prop being NaN bvaughn#829 by @mcordova47
* 🐛 MultiGrid invalid tabIndex prop type bvaughn#818 by @kalley
* 🎉 Columnd default sort direction bvaughn#833 by @mbseid

* 🐛 Server-side rendering 'window' reference bugfix

* 🐛 'Grid.defaultProps' bugfix

* ✨ 'Grid' uses 'requestAnimationFrame' instead of 'setTimeout' for i…

…mproved scroll-ended debounce timing (@guilhermefloriani) - bvaughn#742)

* 🎉 'onRowRightClick' prop added to 'Table' (@damian-codilime) - bvaughn#741)
* 🎉 'Table' component now allow children that extend 'Column' (@CptLemming) - bvaughn#748)
* 🐛 Firefox edge-case bugfix (@ReinAkane) - bvaughn#798)
* 🎉 'onWheel' prop added to 'Grid' (@implausible) - bvaughn#778)
* ✨ 'Grid' accessibility improved via better aria attributes (@smockle) - bvaughn#744)
* ✨ 'CellMeasurererCache.clearAll' also sets row and column counts (@tcosentino) - bvaughn#796)

* 🎉 'InfiniteLoader' API method 'resetLoadMoreRowsCache' accepts opti…

…onal parameter to auto-reload most recent range of rows. (@bamaboy - bvaughn#704)

* 🎉 'MultiGrid' now supports scrolling when hovering over fixed rows or columns by way of new 'enableFixedColumnScroll' and 'enableFixedRowScroll' props. (@danalloway - bvaughn#708)
* 🎉 'WindowScroller' supports new configurable 'scrollingResetTimeInterval' prop (similar to 'Grid'). (@djeeg - bvaughn#728)
* 🐛 Edge-case bugfix for style caching of 'Grids' locked with 'ScrollSync'. (@nathanpower - bvaughn#727/github.com/bvaughn/pull/727))
* ✨ New 'onScrollbarPresenceChange' prop added to 'Grid'.

* 🎉 WindowScroller supports scrollToIndex prop. (@leoasis - bvaughn#643)

* 🎉 Allow ArrowKeyStepper to be used as a controlled component. (@mking-clari - bvaughn#688)
* 🎉New handleScroll method on Grid to better support custom scrollbars. (@5angel - bvaughn#693)
* 🐛 Added edge-case gaurd to WindowScroller  to prevent calling setState when unmounted. (@liorbrauer - bvaughn#689)
* 🐛 Fixed edge-case in Grid where setting an initial scroll-to offset with a height or width of 0 caused the scroll-to prop to be ignored when size later changed. (bvaughn#691)

✨ Better aria roles set for `Table` column cells and headers. (@jchen527

 - bvaughn#681)

🐛 `CellMeasurer` restores `width` and `height` `style` values after measuring to avoid edge-case layout bugs. (@marcelmokos - bvaughn#675)

* ✨ Improved performance for CellMeasurerCache by removing some unnec…

…essary computations for fixed-width/fixed-height use cases. (@RaviDasari - bvaughn#676)

* 🐛 MultiGrid ensures correct row/column indices are passed to CellMeasurerCache for top-right and bottom Grids. (bvaughn#670)

🎉 Add 'nonce' attribute to 'AutoSizer' for better Content Security Po…

…licy compliance (https://www.w3.org/TR/2016/REC-CSP2-20161215/#script-src-the-nonce-attribute). (@akihikodaki - bvaughn#663)

✨ 'Column' renderers now accept a 'columnIndex' parameter as well. This allows multiple 'Table' columns to more easily use 'CellMeasurer' to compute the min row height. (@bamaboy - bvaughn#662)