Merge pull request #9 from manics/omero-build-c6-multienv

Centos 6 image for building OMERO in multiple environments
Remove python27 path if python26 requested

Closes https://github.com/omedocker/omedocker/issues/10
Remove workaround for Cython/tables installation bug

Closes https://github.com/omedocker/omedocker/issues/11