Transaction execute/flush to enqueue/process.
Cypher logging.
Transaction context management; fix #333
Fix log line
enqueue->append; test coverage
Test Relationship.size
Extra comment on Batch; also __bool__ attribute.
Fix comment.
Job class attributes and comments.
Mark Job instances as finished; fixes #235.
Changed Cypher to pre-2.0 compat.
Add limit to Graph.merge; fixes #327.
Graph.find_one; fixes #325; fixes #326.
Intro property->attribute
Merge pull request #354 from nigelsmall/gamma/2.0

Gamma/2.0