Update the intersphinx cached indexes

In case we build docs offline, we want to have a cached copy of the
documentation refs that are in the intersphinx docs we reference.
Update those to the lattest versions from their respective upstreams

docs/docsite/rst/conf.py

@@ -226,5 +226,5 @@ latex_documents = [
 autoclass_content = 'both'
 
 intersphinx_mapping = {'python': ('https://docs.python.org/2', (None, '../python2-2.7.13.inv')),
-                       'python3': ('https://docs.python.org/3', (None, '../python3-3.6.1.inv')),
+                       'python3': ('https://docs.python.org/3', (None, '../python3-3.6.2.inv')),
-                       'jinja2': ('http://jinja.pocoo.org/docs', (None, 'jinja2-2.9.6.inv'))}
+                       'jinja2': ('http://jinja.pocoo.org/docs', (None, 'jinja2-2.9.7.inv'))}