[resolver] fix proxy resolver.
[resolver] fix proxy resolver.

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