Spark Integration: Streams support for Spark Jobs

Spark Integration: reactored
Spark Integration: Added readFromStream without time
Spark Integration: Fixed according to PR1
Spark Integration: Addressed comments of PR2
Spark with Streams unit tests
Spark Integration: Addressed PR3 comments
Spark Integration: Fixed function header
Spark Integration: Spark with streams unit test
Spark Integration: Fix logging string in AbstractSparkContext
Spark Integration: Fixed according to comments
Spark Integration: Remove ambiguous return false statement
fix incorrect usages of ByteBuffer.array()
better impl of Bytes.toString()
Merge pull request #564 from caskdata/feature/spark-streams

Spark Integration: Streams support for Spark Jobs
Merge branch 'feature/fix-bb-array' into develop
Spark Integration: Inc spark program timeout in test
Merge pull request #581 from caskdata/feature/fix-develop

Spark Integration: Inc spark program timeout in test