ScyllaDB release: version 1.3.4

ScyllaDB 1.3.4, released on November 7, 2016, is a bugfix update for the ScyllaDB 1.3 stable branch, ensuring backward compatibility and supporting rolling upgrades. Users are encouraged to upgrade to the latest stable ScyllaDB 1.4 for improved features. This release addresses specific issues, such as an assertion error caused by selecting the same column twice and a failure to restart scylla-jmx after the Scylla server is killed. Contributions from Pekka Enberg include fixes for these bugs, and updates are provided for both the main ScyllaDB and its JMX components. The release highlights the importance of maintaining system stability and encourages users to report problems and contribute to ongoing development.