Make only one site length required, so that images can be resized based on height, too.
Changed behaviour for resizing an image to a larger one or to the exact measure it already has
Revert "Changed behaviour for resizing an image to a larger one or to the exact measure it already has"

This reverts commit 2cfb2ac09676c019bb5827452046d87616ba2575.
Improved image handling
adapted crop=false|null with recent changes
Merge pull request #22 from dotwired/master

More dynamic and strictness