To handle the fact that blog blocks have more than one blogpost and
therefore more than one comment link I've passed the artefact id and
block id in together and appended a '0'
to the front of the id so that the artefact id + block id does not
clash with another block of the same id.

Change-Id: Iddd4dab7afe70e8926a8556cdb55ea8d4dceda06
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>