Added config directory to code sniffer check in travis build file
Added config directory to code sniffer check in travis build file

acelaya/ZF-AcMailer,nomaanp/ZF2-AcMailer,samsonasik/ZF2-AcMailer,acelaya/ZF2-AcMailer,acelaya/ZF-AcMailer,nomaanp/ZF2-AcMailer,samsonasik/ZF2-AcMailer,acelaya/ZF2-AcMailer