Grouping & Aggregators (alpha stage)

Features

• feat(grouping): add first draft of Grouping & Aggregators functionality
  • this is in Alpha stage, things will change, especially the Slick.Data.Aggregators these should not be used directly but I just wanted them working as a POC (proof of concept) for an Alpha release. Future version will separate all Aggregators into their own interfaces and functions, and you will call them from Angular-Slickgrid (just like Formatters).
  • you can give it a try and provide feedback (if so use issue #21), but expect to have to refactor your code in the next version (probably in a week or so)
  • no documentation yet, just look at the demo and ts file for now.

Fixes

• fix(jquery-ui): use latest version of jQuery-UI to avoid jQuery 3 errors
  • previous version wasn't using the latest version of jQuery-UI which is 1.12.1, this version does use it.