riapi: add more constraint tests. appears that scaling and cropping as separate steps can cause inexact results if alternating dimensions are rounded
riapi: add more constraint tests. appears that scaling and cropping as separate steps can cause inexact results if alternating dimensions are rounded

imazen/imageflow,imazen/imageflow,imazen/imageflow,imazen/imageflow,imazen/imageflow,imazen/imageflow,imazen/imageflow