Only implement abstract method setupFilters on implementations.

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

Signed-off-by: crynobone <crynobone@gmail.com>
Remove .gitattributes from export.

Signed-off-by: crynobone <crynobone@gmail.com>
Add PHP 5.6 on travi-ci.

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