1.006           - Replace ElasticSearch with Elasticsearch

1.005           - Not available for perl version < 5.10

1.004           - Faster sessions renamed "lazy"

1.003           - Add support for faster sessions (don't hit ES for every
                  get or set - just once for each retrieve & flush cycle

0.008           - Added signing of the session ID to make it tamper-proof

0.001 - 0.007   - Formative stuff.