TSLint should be less aggressive (part 2)

[jrieken]

This extension bugs you until you install TSLint (globally or for each project) only to then annoy you with more errors about missing configuration.

[mjbvz]

This hasn't been the behavior in recent versions. But the lack of bugging is causing a lot of people to not understand why tslint is not loading or enabled.

The new behavior i'm adding is: report errors about loading tslint if there is a tslint.json in your workspace