Update Visual Studio Code ignores

In Visual Studio Code 0.8.0, .settings is renamed to .vscode; adds
.vscode ignores to .gitignore with an override for tasks.json per microsoft#3156.

Author: Eyas

.gitignore

@@ -21,7 +21,7 @@ tests/services/baselines/local/*
 tests/baselines/prototyping/local/*
 tests/baselines/rwc/*
 tests/baselines/test262/*
-tests/baselines/reference/projectOutput/*
+tests/baselines/reference/projectOutput/*
 tests/baselines/local/projectOutput/*
 tests/services/baselines/prototyping/local/*
 tests/services/browser/typescriptServices.js
@@ -50,3 +50,5 @@ internal/
 **/.DS_Store
 .settings/*
 !.settings/tasks.json
+.vscode/*
+!.vscode/tasks.json