Marked procedure related api as deprecated.
Merge pull request #713 from caskdata/feature/cdap-761-deprecate-api

Marked procedure related api as deprecated.
Merge pull request #716 from caskdata/feature/spark-metrics

Spark Integration: Collect system metrics from Spark
Spark Integration: Added support for custom user metrics in Spark
Spark Integration: Modified SparkMetricsTest to support custom metrics test
Spark Integration: SparkPageRank example emits custom metrics