Fig support

This PR adds FIG orchestration support. It uses upstream containers from kartoza or base images. Please see updated README.md for usage notes.

@akbargumbira I guess we need to pull a specific SHA of InaSAFE? Could you have a play with this and see if it works for you? Also can we remove the SFTP related stuff in the fig defs for inasafe service and rather mount the volumes from sftp directly? It will allow us to remove insecure password storage in the fig file. I think there are a few other bits and pieces in make map that need updating to use your new file system adapter that replaces sftp client.

I think the orchestration part should be more or less sorted out and we just need to review that actual shake running parts.

Happy new year!

Tim