Fixes #2461

[AntonEvers]

Description

Fixed Issues (if relevant)

1. magento/magetno2#2461: Max execution time of 60 seconds exceeded in CLI

Manual testing scenarios

1. set php's max_execution_time to 0
2. run bin/magento setup:static-content:deploy en_US nl_NL de_DE fr_FR en_UK
3. time it to be longer than a minute and see that the error PHP Fatal error: Maximum execution time of 60 seconds exceeded does not appear
4. make sure the command exits succesfully

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[AntonEvers]

This pull request fixes #2461

[vrann]

@ajpevers Thank you for the contribution!

[AntonEvers]

@vrann glad to help!

[AntonEvers]

@vrann I just received news from @tubalmartin:

Just to let you know guys, as the maintainer of YUI-CSS-compressor-PHP-port, that I've just released v3.0.0 which is the most stable release to date. Updating to this version is strongly recommended.

[ishakhsuvarov]

@ajpevers Any chance you would like to submit a PR with that? Or is it too much from the breaking changes perspective?

[AntonEvers]

@ishakhsuvarov I'll check out the differences first. Keep you posted.

[AntonEvers]

@ishakhsuvarov I've tested it and the upgrade is not yet compatible. I can't promise that I'll find the time any time soon to figure out why. So maybe I'll leave it for now. If any of you guys finds the time, supposedly there are performance improvements made in the css minifier. I don't know if they are so big that they make an actual difference in compilation time.