Support py2neo v3 and v4.  py2neo v4 does not have http module and does not have a dump() method for the Cursor object returned from the run methhod.  Make it work for both versions.
Support py2neo v3 and v4.  py2neo v4 does not have http module and does not have a dump() method for the Cursor object returned from the run methhod.  Make it work for both versions.

rorydavidson/SNOMED-CT-Database,IHTSDO/snomed-database-loader,rorydavidson/SNOMED-CT-Database,rorydavidson/SNOMED-CT-Database,IHTSDO/snomed-database-loader,IHTSDO/snomed-database-loader