Add 0.60 release notes
Fix scheduling bug where drivers queued in TaskExecutor are not counted

Create DriverContext when split is added instead of waiting until a thread is associated with the split.
Upgrade to airlift 0.85 and discovery-server 1.17
Move commons-logging exclusion to root POM
Bundle tpch and cassandra plugins with server
Fix dependency scope for commons-math
Check for no tpch nodes when generating splits
Wrap release notes text
Improve TPCH no nodes error message
[maven-release-plugin] prepare release 0.60
[maven-release-plugin] prepare for next development iteration