* Handle typesInstallerInitializationFailed

Display a warning message when the ts typings installer fails to initilize. One possible cause is that npm is not installed

* Fix a spell

Monitors the status of typings acqusition from TS. If we are acquiring typings, in the completion item provider, return an error result that informs the user that the results are incomplete. Typings acqusition is currently capped at 30 seconds per typings install event so that we don't block intellisense forever if something goes wrong