First implementation of get lazy modules entries.

[hansl]

Closes #1636

[TheLarkInn]

Awesome work. Looks great.

[Martin-Luft]

I need the loadChildren feature with webpack and can't wait until RC6 is released therefore I used the nightly builds but it does not work :(

ReferenceError: System is not defined

So I realized that I now need systemjs (in other words... 2 module loaders?)?

Which steps are needed to make the Angular 2 webpack example (https://angular.io/docs/ts/latest/guide/webpack.html) work with loadChildren?

Thank you so much!

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