Support for nquads and json-ld files and other minor fixes.
Support for nquads and json-ld files and other minor fixes.

dmitrizagidulin/solid-server-unstable,dmitrizagidulin/solid-server-unstable,deiu/ldnode,evWork/nds-server,timbl/ldnode,martinmr/node-ldp-httpd,deiu/ldnode,nicola/ldnode,dmitrizagidulin/solid-server-unstable,evWork/nds-server,martinmr/node-ldp-httpd,timbl/ldnode,evWork/nds-server,linkeddata/ldnode,linkeddata/ldnode,nicola/ldnode