Increment version to v1.0.18: Support for density pixel ratio (dpr) transformation parameter. Support auto width, auto dpr and responsive width. Support for background_removal parameter in upload and update. Upgrade jQuery plugin to v1.0.18. Support timeouts in API requests. Fix return_error mode when calling api. Allow user to override secure setting. Replace Exception with ValueError. Support auto-securing URLs if django request is enabled and the current page is being served over HTTPS.