Update grunt-contrib-csslint to version 1.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

grunt-contrib-csslint just published its new version 1.0.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of grunt-contrib-csslint – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 11 commits .

• 70dee40 add quiet_all option
• 0e00ea9 Merge pull request #68 from Eligijuxas/master
• 23cce8c v1.0.0
• 948f5db Added option to disable errors and warnings to console
• 90e20d8 Point main to task
• d53677d Remove peerDeps. Ref gruntjs/grunt#1116
• 8ba3467 Update copyright to 2016
• 0207106 CI: Remove node.js '0.12' and add '5'.
• 536bbb6 CI: test node.js 4.0.
• 38fbca1 Use lodash's checks more.
• 2130bb7 Normalize package.json.

See the full diff.

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