Feature/maximum width or height transformer

New ImageTransformer that resizes the layer. Accepts two Integer params: height and width. Only width **or** height will be scaled and the other dimension will be calculated to keep original ratio. If the original image is smaller than the configured dimensions the image won't be resized
Should be `label = "ACS AEM Commons - Image Transformer - <Transformer Name>"`
Make it super easy to find stuff in Felix if the naming is consistent.