Add some omero-client POMs

These describe two different versions of omero_client.jar that I
downloaded today based on recommendations from the OMERO team:

http://cvs.openmicroscopy.org.uk/snapshots/omero/4.4.8p1/OMERO.clients-4.4.8p1-ice33-b304.linux.zip
http://hudson.openmicroscopy.org.uk/view/2.%20Stable/job/OMERO-stable-ice34/lastSuccessfulBuild/artifact/src/target/OMERO.java-4.4.8-452-cbe42bc-ice34-b326.zip

Of course, the Jenkins build will change over time.

For now, I have made them available from our Maven repository at:

http://maven.imagej.net/content/repositories/thirdparty/ome/omero-client/

Contributing to the project will become much easier once the
OMERO project provides its components in a properly managed way.