Integration of new BLOB service.

Looped through the user code class loader from the envrionment to the tasks.

Added timed cleanup task to LibraryCacheManager to remove automatically unreferenced jar files. Moved registration logic out of the IOReadableWritable serialization logic. Updated logger.

Made the LibraryCacheManager an object instead of a Singleton.

Added proper shutdown of task manager and job manager.

Removed nio import to support Java 6 compilation.

Removed lock map from BlobLibraryCacheManager. Using global lock for synchronization. Marked StackOverflow code. Removed JavaDocs copyright message. Added getUserCodeClassLoader to AbstractInvokable class.

This closes #126 and closes #107.
[FLINK-1106] Deprecate Record API
Updated run-example quickstart (commands, screenshots)

This closes #136
[streaming] Several bugfixes and doc updates
[FLINK-1103] [streaming] Added Twitter streaming example and default inputs for examples
[streaming] CoWindow operator rework + stream iteration example added