refactor(compiler-cli): use the transformer based compiler by default

The source map does not currently work with the transformer pipeline.
It will be re-enabled after TypeScript 2.4 is made the min version.

To revert to the former compiler, use the `disableTransformerPipeline` in
tsconfig.json:

```
{
  "angularCompilerOptions": {
    "disableTransformerPipeline": true
  }
}
```

packages/compiler-cli/integrationtest/test/source_map_spec.ts

@@ -10,7 +10,8 @@ import './init';
 import {BindingErrorComp} from '../src/errors';
 import {createComponent} from './util';
 
-describe('source maps', () => {
+// TODO(tbosch): source maps does not currently work with the transformer pipeline
+xdescribe('source maps', () => {
   it('should report source location for binding errors', () => {
     const comp = createComponent(BindingErrorComp);
     let error: any;