Merge remote-tracking branch 'origin/master' into 9046_2

.gitmodules

CHANGELOG.md

README.md

composer.json

composer.lock

config/environment/test.php

config/global.ini.php

core/Access.php

core/Application/Kernel/EnvironmentValidator.php

core/DataAccess/LogQueryBuilder.php

core/DataAccess/Model.php

core/DataArray.php

core/Date.php

core/FrontController.php

core/Metrics/Formatter.php

core/Period/Day.php

core/Period/Range.php

core/Period/Week.php

core/Piwik.php

core/Plugin/ControllerAdmin.php