Fake screens

See #475.  Both Ant and Maven builds should pass and run the specification tests in ```components/scifio/```.  Fake screen files such as ```SPW&plates=2&plateRows=3&plateCols=3&fields=8&plateAcqs=5.fake``` should have valid OME-XML (```showinf -omexml ....fake```) and should import into OMERO.

I have tested with the above-named file, but it would be good to test with a few other files that vary the number and size of plates.

http://hudson.openmicroscopy.org.uk/view/Bio-Formats/job/BIOFORMATS-merge-develop/ is expected to return to green with this PR included.