Minor tweak and update docblock.

Signed-off-by: crynobone <crynobone@gmail.com>
Move to PSR-4.

Signed-off-by: crynobone <crynobone@gmail.com>
Release v2.1.5

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