[zendframework/zf2#2278][ZF2-513] CS fixes
[zendframework/zf2#2278][ZF2-513] CS fixes

- trailing whitespace

ezimuel/zend-validator,svycka/zend-validator,zendframework/zend-validator,weierophinney/zend-validator,Maks3w/zend-validator,zf2timo/zend-validator,akrabat/zend-validator