Prod build should not contain any comments.

[anufryieu]

Bug Report or Feature Request (mark with an x)

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

Versions.

@angular/cli: 1.0.0
node: 6.9.5
os: win32 x64

Repro steps.

ng build --prod --env=prod --aot=true

Actual functionality.

Builded scripts contain a lot of comments.

Desired functionality.

I want to get the smallest size of build as possible.

Mention any other details that might be useful.

[sumitarora]

Closing Duplicate of #4413

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