Link discovery suggestions by Kingsley Idehen
use only main domain
switch to simpler foaf:topic
move json formatter in core and support json formatting in server
support json in the core configuration
up to date ontology version (fixes #201)
Merge pull request #209 from jimkont/owl_version

up to date owl version (fixes #201)
Merge pull request #204 from jimkont/link_discovery

Link discovery suggestions by Kingsley Idehen