enabled symfony 2.4 on travis
enabled symfony 2.4 on travis

liip/LiipImagineBundle,robfrawley/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,liip/LiipImagineBundle,prolixtechnikos/LiipImagineBundle,robfrawley/LiipImagineBundle