Subgraph tweaks.
Cypher tweaks.
Subgraph subtleties.
Representation -> CypherWriter
Add lang to global export list.
Move CypherWriter.write to top of class.
Fix PropertySet hash function.
Make entities returned from Graph.node and Graph.relationship lazy.
xstr
Unicode/repr tweaks and revert lazy Graph.relationship method.
Str and repr for 2 and 3.
Removed shell.
GeoffWriter
Remove gexf for now
Move command line tools to ext.
Remove gexf for now.
Fix repr for LegacyNode
Updated coverage to exclude ext.
Unit test for Graph.open_browser()