Dockerfile builds a specific version of ABRA2
Dockerfile builds a specific version of ABRA2

The Dockerfile now builds ABRA2 version 2.15 by default, so this should make the whole thing easier to update as ABRA gets updated.  Also, older versions can be built by using a build-time parameter.
mozack/abra2,mozack/abra2,mozack/abra2,mozack/abra2