* Spark features are enabled
* Fixed as PR comments
* minor change
* PR comments fixed
* minor fix
* change constant name to avoid conflicts with sqlopsextension
* sqlContext to context
* Changed tab name to SQL Server Big Data Cluster
* Added isCluster to ContextProvider to control display big data cluster dashboard tab
Ported New/open Notebook code to mssql extension and enable them in dashboard
* Fixed tslint
