refs #6697 start refactoring the DoNotTrack code to allow for adding tests
Merge remote-tracking branch 'origin/master' into dnt_maxthon
Refs #6697 add unit test for DoNotTrackHeaderChecker, with failing test for Maxthon
fixes #6697 We ignore DoNotTrack header on Maxthon browsers, since it is always enabled
Merge pull request #6719 from piwik/dnt_maxthon

For maxthon browsers (Chinese Internet Explorer) then ignore DoNotTrack header as it is always enabled