Added APP_GIT_COMMIT envvar to container
Started to add envvars to container
Added mkdir for docker_env params
Ensure envvars are enclosed to preserve whitespace
Added Dockerfile update for envvars
Added env temporarily to see the vars available from jenkins
Removed APP_GIT_AUTHOR - not available
Merge pull request #15 from ministryofjustice/change_deploy_envvars

Change deploy envvars