[CDAP-505] Added ability to infer IdentityStreamEventDecoder in StreamInputFormat. Updated SparkPageRankProgram to use IdentityStreamEventDecoder
[CDAP-505] Addressed review comments. Reverted SparkPageRankProgram. Updated TestBatchStreamIntegration to use StreamEvent as input value
[CDAP-505] Reverted accidental removal of empty line
[CDAP-505] Trying to restore SparkPageRankProgram again
[CDAP-505] Added type check before casting
[CDAP-505] Added a separate test for decoding using IdentityStreamEventDecoder
[CDAP-505] Reverted accidental stdout checkin
Merge pull request #668 from caskdata/feature/CDAP-505-IdStreamDecoder

[CDAP-505] Added ability to infer IdentityStreamEventDecoder in StreamIn...