Add OMERO 5.3 status

[hflynn]

See https://docs.google.com/document/d/1ZNravyPBdQ8VGbtmruET_Cr1XSuax8gozgMOt_SMmYs/edit and https://trello.com/c/PQ57DZQ8/522-omero-5-3-status

Looks fine built locally, no staging page but you can view it almost rendered by clicking 'view' (note that the images are rendered smaller on the actual post - the width settings don't get applied just in the MD output).

Note: have set date to Monday - won't build locally if that is a future date but I've already checked the local build so should be fine unless you need to edit, in which case you'll have to fetch the branch and make them anyway.

[jburel]

discussed today with @jrswedlow, @joshmoore and @sbesson
We need a section on "compression/tiling" and OMERO so people know we are working to handle such cases.
Closing the PR for now, moving back to g.doc