Improving the 'crop center point accuracy' of CroppedImage

Previously the ImageOps.fit function to used to crop images but I found
its accuracy was lacking. The new approach utilized in this commit
gives significantly more accurate results than using ImageOps.fit,
especially when dealing with PPOI values located near the edges of an
image or aspect ratios that differ significantly from the original
image.

Also:
* Bumping to 0.1.4 release