Fix widths of generated PDF

Fixes apache/grails-doc#250

Author: sdelamo

grails-docs/src/main/groovy/grails/doc/PdfBuilder.groovy

@@ -71,6 +71,7 @@ class PdfBuilder {
     private static String cleanupHtml(File htmlFile, String xml) {
         String result = cleanHtml ? Jsoup.parse(xml).outerHtml() : xml
         result = removeCssLinks(result)
+        result = result.replaceAll('</head>', pdfCss() + '</head>')
         if(debugPdf) {
             File before = new File(htmlFile.absolutePath + '.before.xml')
             before.setText(xml, 'UTF-8')
@@ -106,6 +107,19 @@ class PdfBuilder {
         str
     }
 
+    static String pdfCss() {
+        """<style type="text/css">
+         pre, code {
+          font-size: 10px;
+         } 
+        .contribute-btn, #navigation, #ref-button { display: none; }
+                .paragraph, table, h2, h3, h4, h5, h6, li, pre, code {
+            width: 595px;
+        }
+        </style>
+        """
+    }
+
     static void createPdf(String xml, File outputFile, File urlBase) {
         def dbf = DocumentBuilderFactory.newInstance()
         dbf.validating = false