0.9.2_change_list

#Release 0.9.2

New feature

1. Support LocalCluster/LocalDrpc mode, support debugging topology under local mode
2. Support CGroups, assigning CPU in hardware level.
3. Support simple logview

Bug fix

1. Change SpoutExecutor's RotatingMap to TimeCacheMap, when putting too much timeout tuple is easy to cause deadlock in spout acker thread
2. Tunning gc parameter, improve performance and avoid full GC
3. Improve Topology's own gc priority, make it higher than JStorm system setting.
4. Tuning Nimbus HA, switch nimbus faster, when occur nimbus failure.
5. Fix bugs found by FindBugs tool.
6. Revert Trident interface to 0.8.1, due to 0.8.1's trident interface's performance is better.
7. Setting nimbus.task.timeout.secs as 60 to avoid nimbus doing assignment when task is under full gc.
8. Setting default rpc framework as netty
9. Tunning nimbus shutdown flow
10. Tunning worker shutdown flow
11. Add task heartbeat log
12. Optimize Drpc/LocalDrpc source code.
13. Move classloader to client jar. 14 Fix classloader fail to load anonymous class
14. Web Ui display slave nimbus
15. Add thrift max read buffer size
16. Setting CPU slot base double
17. Move Zk utility to jstorm-client-extension.jar
18. Fix localOrShuffle null pointer
19. Redirecting worker's System.out/System.err to file is configurable.
20. Add new RPC frameworker JeroMq
21. Fix Zk watcher miss problem
22. Update sl4j 1.5.6 to 1.7.5
23. Shutdown worker when occur exception in Smart thread
24. Skip downloading useless topology in Supervisor
25. Redownload the topology when failed to deserialize topology in Supervisor.
26. Fix topology codeDir as resourceDir
27. Catch error when normalize topology
28. Add log when found one task is dead
29. Add maven repository, JStorm is able to build outside of Alibaba
30. Fix localOrShuffle null pointer exception
31. Add statics counting for internal tuples in one worker
32. Add thrift.close after download topology binary in Supervisor