fix(serve): allow relevant live-reload options to function

[clydin]

This provides implementations for the following serve command options:

• live-reload [boolean; default: true] -- flag to control the browser live reload capability
• live-reload-client [URL; default: ssl/host/port command options] -- specify the URL that the live reload browser client will use

Closes #3361

[hansl]

Please provide an e2e tests for those flags, as there isn't one right now.

[mgol]

@clydin Do you think you'll have time to finish this soon? My team needs this PR so I'm happy to help if you want.

[filipesilva]

Merged via #4744

[fabionolasco]

The "ng serve --live-reload false" is still not working for me. I have Angular CLI 1.0.0-beta.26. Does anybody ever got that to work?

[mgol]

@fabionolasco Your CLI version is very, very old; update it first to the latest one.

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