Support assetsPublicPath in webpack config

[gendalf]

When assetsPublicPath in webpack isnt "/", module not add it to svg url in xhr

[mrsum]

@gendalf you are right. which logic u expect?

[gendalf]

assetsPublicPath = "/"
svg = { path : "assets/svg.." }
Injected with path http://.../assets/svg... = 200

assetsPublicPath = "/clientroom"
svg = { path : "assets/svg.." }
Injected with path http://.../assets/svg... = 404
But can access by http://.../clientroom/assets/svg.. = 200

assetsPublicPath = "/clientroom"
svg = { path : "clientroom/assets/svg.." }
Injected with path http://.../clientroom/assets/svg... = 404