[Java API] Fix equality checks on PojoTypeInfo
[APIs] Add ExecutionConfig
[FLINK-1325] [Java API] Add Java ClosureCleaner

This closes #269
[FLINK-1325] [Java API] Minor cleanups on the ClosureCleaner
Bump version to 0.9-incubating-SNAPSHOT
[streaming] DataStream print functionality update

PrintSinkFunction now explicitly states threads in output
Added printToErr functionality
[streaming] [examples] Refactor and packaging for windowing examples

The current examples show-case the API, more meaningful examples are coming for the 0.9 release.