Python2 compatibility + sparql server

lod/extract_data.py

@@ -1,5 +1,8 @@
 
 import sys
+from future.standard_library import install_aliases
+install_aliases()
+
 from urllib import request, parse
 from rdflib import Graph, term
 from lxml import etree

lod/requirements.txt

@@ -1,3 +1,4 @@
+future
 rdflib
 rdflib-jsonld
 lxml