Re-add `_visualize` to `Base`, and deprecate it
Re-add `_visualize` to `Base`, and deprecate it

Users should use `visualize` instead.

vikhyat/dask,ssanderson/dask,PhE/dask,clarkfitzg/dask,chrisbarber/dask,ContinuumIO/dask,cowlicks/dask,blaze/dask,jcrist/dask,blaze/dask,jcrist/dask,dask/dask,mrocklin/dask,wiso/dask,gameduell/dask,jakirkham/dask,ssanderson/dask,pombredanne/dask,jakirkham/dask,vikhyat/dask,cpcloud/dask,PhE/dask,mraspaud/dask,mikegraham/dask,ContinuumIO/dask,wiso/dask,clarkfitzg/dask,dask/dask,mrocklin/dask,jayhetee/dask,mraspaud/dask,pombredanne/dask,jayhetee/dask