Add option to disabling clearing of terminal console

[a-morales]

Following the guide for integrating with a node backend, I found it a bit inconvenient having the start script clearing the console every time a file was saved when running everything through foreman.

This just adds the option to pass in a --verbose(not sure if this is the right flag name) option to the start script that won't clear the console. I've read the contributing guideline, and maybe this should be an option that is enabled by default whenever proxy is defined in package.json.

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[gaearon]

Is this related to #1032? Does #1032 already solve this?

[a-morales]

@gaearon This is related to #1032, and I just gave this a try on the master branch and it works. I'll close the PR.

[gaearon]

Great! We’ll try to get it out within a week or two.