Repro for microsoft/vscode-node-debug#33

After cloning, one should do

1. npm install
2. bower install
3. open the folder in the VSCode,
4. set breakpoint at line 9 in src/app/app.spec.js
5. Hit F5 to start debugging

Expected: breakpoint is hit and I recall I definitely saw this working on pre v0.9.1

Actual: breakpoint is not hit