Py-ART version 1.11.3

Py-ART version 1.11.2

Py-ART version 1.11.1

Merge pull request ARM-DOE#893 from zssherman/doc_rtd_enhancement

DOC: Update to docs to use rtd theme and remove python 2 from docs.

REL: Py-ART Release v1.10.4 Impressionism.

Py-ART version 1.10.3

Py-ART version 1.10.2

Py-ART version 1.10.1 impressionism

Py-ART version 1.9.2 Picasso

Py-ART version 1.9.1-picasso