* immutable crossfilter
* first cut at reducer refactor with cascade model
* add initial redo/undo implementation
* small optimization
* integrate expression with history
* add tests for new reducers and fix a couple of small initialization bugs
* treat tiny lasso selections as a clear
* better function name for clarity
* fix undo for differential expression
* remove logging
* fix regression due to bad merge
* cleanup and comments for clarity
* improve undoable configuration for flexibility
* fix stale comments
* remove debugging code from production build
* rename categoricalSelectionState
* rename file
* improve comments
* toast test
* modify webpack build to allow for global CSS; use CSS modules to scope component styling
* remove heatmap
* add label to index resets
* swapping out buttons for blueprint
* adding constants to globals
* swapping out blueprint buttons
* title position, sidebar improvements
* sidebar styles
* adding toasts for validation errors
* zebra section trial
* integrating blueprint, switching buttons over, breaking out scatter
* clean up console
Bruce Martin