New features
[LIVY-7] Added autocompletion to REST API and Scala API for Interactive Sessions
[LIVY-19] Added Spark SQL interpreter for Interactive Sessions
[LIVY-104] Updated Livy project to build using Scala 2.11
[LIVY-245] Added support for shared variables across Jobs
[LIVY-299] Support multi-line output in statements
[LIVY-397] Support multiple languages in a single Session