Allow scaling of image with scp
Allow scaling of image with scp

rdb scp <imagePath>           (keeps original dimensions)
rdb scp 300 <imagePath>       (if original image width is greater than 300, scale width down to 300 while maintaining aspect ratio)
rdb scp x400 <imagePath>      (if original image height is greater than 400, scale height down to 400 while maintaining aspect ratio)
rdb scp 600x800 <imagePath>   (if original image width or height is larger, scale image down to at most 600 wide and 800 tall while maintaining aspect ratio)

petershu/rdb