This PR adds tsconfigs for each separate application:
- `src/tsconfig.app.json`: configuration for the Angular app.
- `src/tsconfig.spec.json`: configuration for the unit tests. Defaults to the Angular app config.
- `e2e/tsconfig.e2e.json`: configuration for the e2e tests.
There is an additional root-level `tsconfig.json` that is used for editor integration.
For Angular version 4 projects, these tsconfigs will use inheritance since it's available with TypeScript 2.1.
This is not a breaking change. Existing projects should not be affected.
Currently dev builds use `--output-hashing=none` by default.
This can cause image resources to be overwritten in dev if they have the same same.
This wasn't much of a problem before when only images in global CSS would be treated as resources, but now component css also does that.
Production builds are unaffected since they already use `--output-hashing=all`.
BREAKING CHANGE: dev builds will hash relative resources from CSS (images, etc).
