panique/php-mvc — pull request #85 by digitaltoast (2014-06-16 10:27:29+00:00)
Title: Remove X-UA-Compatible - see desc

not required these days, and meta tag is not the correct place causing invalidation errors. See http://www.validatethis.co.uk/news/fix-bad-value-x-ua-compatible-once-and-for-all/