turn off uglify warnings in production

[mhamel06]

Fix #1836

[clydin]

Could the warnings be hidden behind a verbose command line option? They could be useful to some.

[filipesilva]

@TheLarkInn, what do you think?

[alexciesielski]

+1, warnings in production should be opt-in

[Brocco]

This needs to be configurable based upon a flag on the build command.

[alexciesielski]

Actually I would rather have these warnings in development mode with actual line numbers so I can fix those warnings then.

[clydin]

They are not actually warnings. They are a list of uglifyjs optimization actions.

[hansl]

This was made obsolete by the latest changes to logging.

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