XBlock for grouping other XBlocks together into a "unit" of learning.
This is meant to replace most usages of the "vertical" XBlock, which is part of edx-platform.
This XBlock comes with a Docker test environment ready to build, based on the xblock-sdk workbench. To build and run it:
$ make dev.run
The XBlock SDK Workbench, including this XBlock, will be available on the list of XBlocks at http://localhost:8000