added mpi libraries. added dockerfile dependencies

Added openmpi packages. ref #114

Dockerfile dependencies (core, julia_v0.3, julia_nightly docker images) which
were part of a separate project are now moved into the same project. We do not
trigger Dockerhub builds from github anymore as Dockerhub is not stable yet.
Merge pull request #122 from tanmaykm/tanmaykm

added mpi libraries. added dockerfile dependencies