Add support for --log-level option

[eizengan]

Without the ability to override it, --log-level info is implied when wkhtmltopdf executes. This - for some unholy reason - sends progress messages to stderr, which has the unfortunate side-effect of making WickedPdf panic dramatically over successfully completed tasks when run with raise_on_all_errors: true.

The intent of the changes herein is to ensure sensible behavior when running with log_level: 'error', raise_on_all_errors: true.

[unixmonkey]

Oh, that's odd. I wonder if it's the same for older versions of wkhtmltopdf?

We used to pass -q (or --quiet) on non-Windows systems by default, but that got changed at some point somewhat recently. I wonder if that fixes your issue, or causes it to ignore errors?

Would you mind checking that out and maybe adding an option for --quiet too?

[eizengan]

@unixmonkey Ah! Very likely related. From the man page:

[-q is] maintained for backwards compatibility; Same as using --log-level none

I can add support for --quiet tomorrow if you'd like

[unixmonkey]

Thank you!

[eizengan]

Happy to help. Thanks for maintaining this gem!

[unixmonkey]

By the way, this is now in version 1.4.0 of the gem.

[eizengan]

Nice! Wasn't expecting to switch my Rails app from my fork so soon - I appreciate the quick turnaround