should provide the file information to `modifyUnreved/modifyReved` method?

[icai]

I think that should provide file information to modifyUnreved and modifyReved method.

https://github.com/jamesknelson/gulp-rev-replace/blob/master/index.js#L82

if the css image use the relative path, may have the same url string, so provide the file information to compare with each other.