Support for custom PipelineDraweeControllerBuilder

[luciofm]

Add support for a custom PipelineDraweeControllerBuilder.

This way is possible to have animated GIFs working on the Viewer.

    PipelineDraweeControllerBuilder builder = ImageViewer.createPipelineDraweeControllerBuilder();
    builder.setAutoPlayAnimations(true);
    new ImageViewer.Builder<>(this, posters)
            .setCustomDraweeControllerBuilder(builder)
            .setStartPosition(startPosition)
            .show();

[dmachacon]

I hope this gets merge soon.