FLIMFit downloads page (rebased onto develop)



This is the same as gh-58 but rebased onto develop.

----

Add first version of FLIMFit downloads page generation to ome-release.
This PR should be used and tested in coordination with the new http://ci.openmicroscopy.org/view/Consortium/job/FLIMFit-release/ and http://ci.openmicroscopy.org/view/Consortium/job/FLIMFit-release-downloads/ jobs.

/cc @imunro @hflynn