+ update doc copySpec to prevent images from being filtered

docs/build.gradle

@@ -21,15 +21,25 @@ def imagesDir = new File(projectDir, 'src/reference/resources/images');
 [docbookHtml, docbookFoPdf, docbookHtmlSingle]*.admonGraphicsPath = "./images/admon/"
 [docbookHtml, docbookFoPdf, docbookHtmlSingle]*.imgSrcPath = "${imagesDir}"
 
+// defined separately to prevent the replacement from taking place (seems to affect the images)
+imgSpec = copySpec {
+    into ('reference') {
+        from("$projectDir/src/reference/resources") {
+            include "css/**/*"
+        }
+    }
+    
+    into ('reference/images') {
+       from (imagesDir)
+    }
+}
+
+
 refSpec = copySpec {
     into ('reference') {
         from("$buildDir/docs") {
            exclude '*.fo'
         }
-        from("$projectDir/src/reference/resources")
-    }
-    into ('reference/images') {
-        from (imagesDir)
     }
     
     p = new Properties()
@@ -40,6 +50,8 @@ refSpec = copySpec {
     }
     
     filter(ReplaceTokens, tokens: p)
+    
+    with(imgSpec)
 }
 
 task reference (type: Copy) {