Centos 6 image for building OMERO in multiple environments

First attempt at an all-in-one base image for building OMERO from source. Should contain all the dependencies needed to run `docs/hudson/OMERO.sh`. Two versions of Postgres are installed but neither are configured, The general idea is to have one dumb image with all dependencies installed (if this image is built from scratch it is likely to be the most time consuming step), then eventually a second image with runtime configuration for testing, and automatic source download and/or build. So far I've only tried ice35 java7 python26. Python 27 is installed but I've no idea what will happen with Ice- surprisingly `import Ice` from the Zeroc packages (which shoiuld be built against 26) works in Python 27.