v5.1.0

• Extend default, media and font cache TTL to 1 year [5df6946]
• Support ETags at server level [7956cbc]
• Add image/x-icon compression support [69ddeda]
• Improve httpd-modules availability checks [cb8ef1b]
• Improve inline comments

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Thanks to @jamieburchell @tomkyle @LeoColomb