Fixed gradients in PostScript output
Linear gradients were not rendered properly in non-square shapes
Gradial gradients don't need to be rasterized in ellipses


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1609508 13f79535-47bb-0310-9956-ffa450edef68