* First crack tsql notebook (no output rendered yet)
* getting messages back
* intellisense working first cell, no connection errors
* sql notebook cell output functioning
* Latest SQL noteobook changes
* Undo change to launch.json
* Plumbing providers through
* Kernels shown from multiple providers, can switch between them. No mementos yet
* Ensure we have a feature flag for SQL notebooks, ensure existing functionality still works
* Fix tslint duplicate imports issue
* Addressing PR comments
* second round of PR feedback to cleanup notebook service manager code
* merge latest from master
