add supportsThreadSafeTransaction for graphs that may not use a ThreadLocal transaction manager.
TransactionalGraph and rollback
Sparksee GraphSail support
Merge pull request #505 from SparsityTechnologies/master

Sparksee v5.1.0
Update CHANGELOG.textile
Blueprints 2.6.0 release.
@joshsh bug in CHANGELOG
Bumped to 2.7.0-SNAPSHOT.
Update the tinkerpop.version property.
Merge branch 'master' of https://github.com/tinkerpop/blueprints into queryoptimization