Preserving aspect ratio when cropping despite source image size

Previously, if an image was smaller than the requested dimensions, the image was not cropped at all. So if you called Croppa::url($url, 500,500) image but the source was 500x400, you would get the original 500x400 image outputted.

Now, Croppa will give you a 400x400 image. In other words, it is preserving the original aspect ratio despite the source image size. This is important if you are showing a bunch of images in a grid and don't want gaps but you can't be sure that the source images are all big enough.

This release also adds a upscale option that will tell Croppa to scale up images to match your requested dimensions. So, using the example above, with upscale set to 1, you will get a 500x500 image.