Remove copyright comments from vendor.bundle.js

[YagoLopez]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x ] feature request

Versions.

@angular/cli: 1.2.0
node: 6.10.0
os: win32 x64
@angular/common: 4.2.6
@angular/compiler: 4.2.6
@angular/core: 4.2.6
@angular/forms: 4.2.6
@angular/http: 4.2.6
@angular/platform-browser: 4.2.6
@angular/platform-browser-dynamic: 4.2.6
@angular/router: 4.2.6
@angular/cli: 1.2.0
@angular/compiler-cli: 4.2.6

Mention any other details that might be useful.

In my opinion after AOT compilation could be convenient to leave only one copyright note on "vendor.bunle.js" to reduce file size. Now you have a lot of comments repeated. See this example:

https://yagolopez.js.org/ng-dashboard/dist/vendor.bundle.js

[grizzm0]

Already seems to be part of 1.3.0-beta.0.
See #4694

[YagoLopez]

@grizzm0 Great! Thanks for the info. I had searched for this topic before opening the issue but found nothing. Excuse me.

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