Cli: Allow --site-id on deploy command

[bendg25]

- Do you want to request a feature or report a bug?

feature

- What is the current behavior?

deploy uses .netlify/json file. I would like to pass site id as a parameter.

- If the current behavior is a bug, please provide the steps to reproduce.

- What is the expected behavior?

- Please mention your node.js, and operating system version.

[bcomnes]

We allow the use of the environment variable NETLIFY_SITE_ID, to override or bypass the link step, but I'm thinking maybe a flag could be helpful here as well.

[jared-evari]

Specifying a site ID when running the command is very useful when deploying multiple sites at the same time (eg. from a mono repo).

[bcomnes]

Ok, I decided to to this. Stay posted.

[bcomnes]

I released a beta that should address this issue: see https://github.com/netlify/cli/pull/147#issuecomment-429497857

Expect a full release monday.

[bcomnes]

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