Revert "bump to 1.2 after shell revert"

This reverts commit e2fcb76f6f6ee99a98ee529917959235576e2d07.
Revert "Revert "use shell=True for subprocess because that's a lot simpler, update README""

This reverts commit ecf579b59a3ee405ecddca836297065aa372438b.
allow specifying a SHELL in settings_deploy.py but default to /bin/bash