Added GRCh38 to GRCh37 conversion
Added GRCh38 to GRCh37 conversion

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