Show block example (#3601)
Show block example (#3601)

* Separate chunk construction from data structuring

Make it a little clearer what the structure of the data chunks are by
refactoring out the pieces.

* Show how `block` can be used to join Dask Arrays

Provides a simple demo of how `block` can be used to join smaller Dask
Arrays together along multiple axes at once.

ContinuumIO/dask,dask/dask,jcrist/dask,dask/dask,jakirkham/dask,ContinuumIO/dask,blaze/dask,jcrist/dask,mrocklin/dask,mrocklin/dask,jakirkham/dask,blaze/dask