add /status endpoint to nodejs server + test
synced code with most recent changes
CDAP-538: Updated WordCount service to use QueryParam argument instead of PathParam.
updated Spark job UI to display the collected metrics in blocks
Merge pull request #661 from cybervisiontech/CDAP-538-word-count-app-query-param

Updated service method to use QueryParam instead of PathParam of WordCount application.
Merge pull request #645 from caskdata/feature/nodejs-healthcheck

add /status endpoint to nodejs server + test
fixed comments
fixed comments
Merge pull request #662 from cybervisiontech/CDAP-652-spark-job-metrics-blocks

CDAP-652: updated Spark job UI to display the collected metrics in blocks
fixed comments
Merge pull request #660 from cybervisiontech/CDAP-713/HelloWorld-example-archetype

CDAP-713: Update HelloWorld example archetype