Cleaned up and re-organized PS gradient test case


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611648 13f79535-47bb-0310-9956-ffa450edef68
Added test case for the gradient package


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611649 13f79535-47bb-0310-9956-ffa450edef68
Removed unused functionType parameter


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611650 13f79535-47bb-0310-9956-ffa450edef68
For a Shading object, domain is optional and its default value is what we need


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611651 13f79535-47bb-0310-9956-ffa450edef68
Check bounds and encode


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611652 13f79535-47bb-0310-9956-ffa450edef68
Added more complete tests
Keep floats for bounds instead of converting them to doubles


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP-2393_gradient-rendering@1611653 13f79535-47bb-0310-9956-ffa450edef68