warnings in aot build.

[ShankarSumanth]

After the inital project setup. Multiple warnings are shown when a aot build is done .

Steps:

1. npm run build:aot

Output

WARNING in ./src/app/app.component.ngfactory.js
(Emitted value instead of an instance of Error) Cannot open SourceMap
'.../src/app/app.component.ngfactory.js.map': 
Error: ENOENT: no such file or directory, ...src/app/app.component.ngfactory.js.map'

[qdouble]

I've disabled sourcemaps in aot, not quite sure what causes it...but will take a pull requesst