Merge branch 'master' into 3490_user_id

CHANGELOG.md

composer.json

composer.lock

config/global.ini.php

core/API/Request.php

core/BaseFactory.php

core/Config.php

core/DataTable/Renderer.php

core/Date.php

core/Error.php

core/Log.php

core/Menu/MenuAbstract.php

core/Piwik.php

core/Plugin/Controller.php

core/Plugin/Menu.php

core/Plugin/Widgets.php

core/ReportRenderer.php

core/View.php

core/testMinimumPhpVersion.php

lang/cs.json