feat(@angular/cli): add publicPath support via command for webpack-dev-server

[scriste-sv]

This adds support for publicPath to webpack-dev-server via ng serve
The server would have to be started like ng serve --deploy-url /deploypath --base-href /deploypath.
The app will be served from http://localhost:4200/deploypath

Should fix #2727

[scriste-sv]

@filipesilva could you please review and let me know if this is eligible for to complete the fix on #3285 and address the issues with ng serve?

Thank you.

[filipesilva]

Heya, thanks so much for adding this! I've wondered for a while if it would work. Cheers!

[scriste-sv]

Great, thanks @filipesilva

[josipledic]

Is it possible to let the port be the port that is specified inside the angular-cli.json? Like this the port 4200 is hard coded :(

[filipesilva]

@ledicjp yes, you can add it in the defaults.serve section. See https://github.com/angular/angular-cli/wiki/angular-cli for details.

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