fix(@angular/cli): serve --live-reload option

[cherryland]

Due to the replacement of the broccoli build system with webpack in v1.0.0-beta.11-webpack, the serve --live-reload option gets ignored.

We need to extend the black boxed configuration, to control watch mode in webpack-dev-server.

Related Issues:

• Command is not available："ng serve --live-reload false" #4556

Related Pull Requests:

• Merge Webpack Feature branch into Master #1455

[clydin]

There's an in-progress PR (#3952) for live-reload related functionality.

[cherryland]

@clydin Your PR (#3952) does not fix the issue mentioned above, but thankfully it fixes/erases some of obsolete live-reload-* options.

[clydin]

That PR stops live reloading from occurring so it does address the issue. Whether file watching and rebuilding should be disabled as well is an open question.

[filipesilva]

Closing in favor of #3952, it's a more complete PR.

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