Make url resolving optional

[andreyvolokitin]

Sometimes the project has custom URL resolving strategy so URL resolving on the SASS side is undesired. I.e. in my case I use a concept of "source root" in my IDE to write all URLs inside SASS files relative to it, and not to the SASS file itself. Then my IDE knows how to resolve these URLs and I can skip writing ../../ chains to make URLs truly relative.

I rewrite URLs later with PostCSS for css-loader to resolve them, and have no problems. But with fast-sass-loader it breaks because it rewrites my URLs. I thought that making url resolving optional could be helpful in such cases

[coveralls]

Coverage decreased (-1.1%) to 83.914% when pulling e4474f7 on andreyvolokitin:optional-url-resolve into 324e8d6 on yibn2008:master.

[coveralls]

Coverage decreased (-1.1%) to 83.914% when pulling e4474f7 on andreyvolokitin:optional-url-resolve into 324e8d6 on yibn2008:master.