* Added option `no-upscale, nu` as resizing strategy to decline upscaling of smaller images. Fix #61.
* Minor change in `CImage::resize()`, crop now does imagecopy without resamling.
* Correcting internal details for save-as and response json which indicated wrong colors. Fix #62.
* Fixed fill-to-fit that failed when using aspect-ratio. Fix #52.
* JSON returns correct values for resulting image. Fix #58.
* Corrected behaviour for skip-original. Fix #60.