Add options --no-progress and --quiet

[MetalArend]

As mentioned in #73, it would be handy to have an option to disable the progress output.

--no-progress to disable the output of the progress bar
--quiet to disable all output that are not errors

So using only --no-progress could perhaps return some success message, while --quiet only outputs errors if there are any.

WDYT?

[grogy]

Is possible to add it. But my first question will be for using - why do you want it? Maybe will we find better solution. :-)

[MetalArend]

It would be very handy to be able to avoid obsolete output inside CI logs, without hiding the more important output of the lint tool (that would possibly be hidden when using grep filters or redirections to /dev/null).

[grogy]

--no-progress is good idea from my opinion. We can create a PR.
--quiet - it's look too magic. Do you using another tool whit this option / behaviour?

[JakubOnderka]

--no-progress was added to current master. I think, --quiet is not now necessary, but maybe in future will be added.

[MetalArend]

--quiet would give you the possibility to not show any output as long as there are no errors. In such circumstances your exit code would not error out as always, but with this flag enabled it will also not write anything to your logs.

Thanks for adding the --no-progress, that's what I originally created the issue for, adding the --quiet flag was just for completeness (I figured once you're in there, better solve them all :p).