Generate a unique Id for each section

lib/parse/page.js

@@ -56,6 +56,9 @@ function parsePage(src) {
         return section;
     })
     .map(function(section) {
+        // Generate a uniqueId to identify this section in our code
+        var id = _.uniqueId('gitbook_');
+
         // Transform given type
         if(section.type === 'exercise') {
             var nonCodeNodes = _.reject(section, {
@@ -67,6 +70,7 @@ function parsePage(src) {
             });
 
             return {
+                id: id,
                 type: section.type,
                 content: render(nonCodeNodes),
                 code: {
@@ -79,6 +83,7 @@ function parsePage(src) {
 
         // Render normal pages
         return {
+            id: id,
             type: section.type,
             content: render(section)
         };