* Added configuration to limit ShellBolt internal _pendingWrites queue length (thanks xiaokang)

* Fixed a a netty client issue where sleep times for reconnection could be negative (thanks brndnmtthws)

* Fixed a display issue with system stats in Storm UI (thanks d2r)

* Nimbus now does worker heartbeat timeout checks as soon as heartbeats are updated (thanks d2r)

* The logviewer now determines log file location by examining the logback configuration (thanks strongh)

* Allow tick tuples to work with the system bolt (thanks xumingming)

* Add default configuration values for the netty transport and the ability to configure the number of worker threads (thanks revans2)

* Added timeout to unit tests to prevent a situation where tests would hang indefinitely (thanks d2r)

* Fixed and issue in the system bolt where local mode would not be detected accurately (thanks miofthena)