Bump min version to PHP 5.4

Signed-off-by: crynobone <crynobone@gmail.com>
Small clean-up.

Signed-off-by: crynobone <crynobone@gmail.com>
Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>
Ensure only ACL metric information is synced to `orchestra/memory` for #25.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1'