Revert "Choose specific version of galaxy source code."
Revert "Choose specific version of galaxy source code."

This reverts commit fa4ffad69c8e3499be34f140df9ff642eb43b09a.

chambm/docker-galaxy-stable,bgruening/docker-galaxy-stable,bgruening/docker-galaxy-stable,bgruening/docker-galaxy-stable,chambm/docker-galaxy-stable,chambm/docker-galaxy-stable