stop on compilation errors in typescript applications

[Fatme]

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.1.2
• Cross-platform modules: 6.1.0
• Android Runtime: 6.1.0
• iOS Runtime: 6.1.0
• Plugin(s):
• Node.js:

Fixes the limitation mentioned here.

To Reproduce

1. Create typescript project
2. tns run <platform>
3. Make a semantic error within the application

Expected behavior

The webpack compilation should stop.