tsconfig extends with paths

[fabiandev]

@dennispg I've tested your contribution and I really like your approach of using a separate tsconfig.json and the extends option.

However, in the app where I'm using this package, I've also defined some custom paths, which overwrite the paths defined in tsconfig.jspm.json. It seems like TypeScript does not merge this field when extending configs.

Do you have any experience with that or know a way of how to get around this? Otherwise I will have to look into other approaches or have to go back the one that is currently in use.

[fabiandev]

What do you think of the latest approach I've pushed to the 0.2 branch:

• Rename tsconfig.json to tsconfig.app.json
• Adjust plugin-typescript options to use tsconfig.app.json (required until v8.0.0, see tsconfig extends frankwallis/plugin-typescript#214 and Support configuration inheritance frankwallis/plugin-typescript#215)
• A tsconfig.json that extends tsconfig.app.json will be created

Your initial solution would have been much cleaner, so if there's anything to make it work, let me know :)

[fabiandev]

v0.2.0-beta.2 is now published to npm under the next tag.