dhimmel/hetio v0.2.2: add py2neo 3 support

Added py2neo 3 support by @veleritas . See #4 #6 #8.

Change default queue sizes in neo4j importing for speed improvement. See #5. Thanks @veleritas.

Add n_nodes and n_nodes attributes that store the total number of nodes and edges in the graph.

This version has a malformated description on PyPI, hence users are recommend to use v0.2.3 instead.