add bibsonomy again

[white-gecko]

@JJ-Author @SimonBin

The exhibit/bibsonomy code from the OntoWiki templates is here https://github.com/AKSW/aksw.org/blob/master/site/items/publications.phtml

[SimonBin]

or https://github.com/KonradHoeffner/rickview/blob/a024efc6262a7787af8a2915eb94b5262d5fc9c3/data/resource.html#L17