Lerna: [Feature] Flag for turning off progressbar

[sveisvei]

I would like an explicit flag/env-variable for turning off the progress bar, because NODE_ENV=test might create other side effects. My specific issue is with travis.

Error with travis:

project/node_modules/progress/lib/node-progress.js:131
  complete = Array(completeLength + 1).join(this.chars.complete);
             ^
RangeError: Invalid array length

https://github.com/lerna/lerna/blob/b75a2374b73e8a2a58a4613aab7e9c753296662f/src/progressBar.js#L21

Maybe LERNA_CONFIG_PROGRESS=false or something?

[jamiebuilds]

I would just copy whatever flag npm already uses for this, I believe it's --no-progress

[stale[bot]]

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