CBD-1217:  add HTML_repo_pair(), pass colors into HTML cell elements

Change-Id: I9f4cdc089bfa60ae9f0199e40a350622d6b4c7fb
Reviewed-on: http://review.couchbase.org/33127
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>