v0.5.0.
Now rollback mechanism is functional for transactions ans subscriptions.
Added bench file and dir and also some dummy examples.
Updated Libra to v0.6.0 and Syllabus to v0.21.0.
On branch master
new file:   bench/run.sh
new file:   bench/spade-bench.js
new file:   example/hiredis-example.js
modified:   package.json