added dbxrefs in the inserts/library.json
added dbxrefs in the inserts/library.json

4dn-dcic/fourfront,ENCODE-DCC/snovault,ENCODE-DCC/encoded,4dn-dcic/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,ENCODE-DCC/snovault,hms-dbmi/fourfront,ENCODE-DCC/snovault,kidaa/encoded,hms-dbmi/fourfront,kidaa/encoded,ENCODE-DCC/encoded,kidaa/encoded,kidaa/encoded,ENCODE-DCC/encoded,hms-dbmi/fourfront,ENCODE-DCC/snovault,ENCODE-DCC/encoded,T2DREAM/t2dream-portal,4dn-dcic/fourfront,T2DREAM/t2dream-portal,kidaa/encoded,T2DREAM/t2dream-portal,ENCODE-DCC/snovault,T2DREAM/t2dream-portal,4dn-dcic/fourfront