Added some documentation to Outside the web root chapter
Added some documentation to Outside the web root chapter

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