Merge pull request #1 from MDSplus/feature/ubuntu

This new branch is a feature branch, with a modified read me
Add ubuntu-64 build image
Merge branch 'master' of github.com:MDSplus/Docker
Update build images
Add a dockerfile for rhel5 mdsplus builds
More build docker files
Add rhel7 build support
Fix rhel5 to use devtoolset-1.1 for gcc 4.7
Merge branch 'master' into develop