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/src/main.ts

@@ -7,14 +7,19 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-
 // Must be imported first, because Angular decorators throw on load.
 import 'reflect-metadata';
 
 import * as ts from 'typescript';
 import * as tsc from '@angular/tsc-wrapped';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as ngc from './ngc';
+
 import {isSyntaxError} from '@angular/compiler';
 
+import {readConfiguration} from './perform-compile';
+
 import {CodeGenerator} from './codegen';
 
 function codegen(
@@ -46,6 +51,19 @@ export function main(
 
 // CLI entry point
 if (require.main === module) {
-  const args = require('minimist')(process.argv.slice(2));
-  main(args).then((exitCode: number) => process.exit(exitCode));
+  const args = process.argv.slice(2);
+  const parsedArgs = require('minimist')(args);
+  const project = parsedArgs.p || parsedArgs.project || '.';
+
+  const projectDir = fs.lstatSync(project).isFile() ? path.dirname(project) : project;
+
+  // file names in tsconfig are resolved relative to this absolute path
+  const basePath = path.resolve(process.cwd(), projectDir);
+  const {ngOptions} = readConfiguration(project, basePath);
+
+  if (ngOptions.disableTransformerPipeline) {
+    main(parsedArgs).then((exitCode: number) => process.exit(exitCode));
+  } else {
+    process.exit(ngc.main(args, s => console.error(s)));
+  }
 }