Create a .deployed_env file with the environment name

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Add pre_deploy script

Will abort deployment if it ends with a non-zero exit code

Signed-off-by: Pedro Melo <melo@simplicidade.org>
Add cleanup_deploy script

Signed-off-by: Pedro Melo <melo@simplicidade.org>