Fix generation of pdf header/footer

lib/output/ebook.js

@@ -72,7 +72,8 @@ EbookOutput.prototype.getPDFTemplate = function(tpl) {
             // Nunjucks context mapping to ebook-convert templating
             page: {
                 num: '_PAGENUM_',
-                title: '_TITLE_'
+                title: '_TITLE_',
+                section: '_SECTION_'
             }
         },
         this.getContext()
@@ -82,7 +83,7 @@ EbookOutput.prototype.getPDFTemplate = function(tpl) {
 
     // Inline css, include css relative to the output folder
     .then(function(output) {
-        return Promise.nfcall(juice.juiceResources, tpl, {
+        return Promise.nfcall(juice.juiceResources, output, {
             webResources: {
                 relativeTo: that.root()
             }