lib/output/ebook/onFinish.js: Use lowercase summary.html filename from themes

lib/output/ebook/onFinish.js

@@ -9,6 +9,7 @@ var command = require('../../utils/command');
 var writeFile = require('../helper/writeFile');
 
 var getConvertOptions = require('./getConvertOptions');
+var SUMMARY_FILE = 'SUMMARY.html';
 
 /**
     Write the SUMMARY.html
@@ -20,12 +21,12 @@ function writeSummary(output) {
     var options = output.getOptions();
     var prefix = options.get('prefix');
 
-    var filePath = 'SUMMARY.html';
+    var filePath = SUMMARY_FILE;
     var engine = WebsiteGenerator.createTemplateEngine(output, filePath);
     var context = JSONUtils.encodeOutput(output);
 
     // Render the theme
-    return Templating.renderFile(engine, prefix + '/SUMMARY.html', context)
+    return Templating.renderFile(engine, prefix + '/summary.html', context)
 
     // Write it to the disk
     .then(function(html) {
@@ -53,7 +54,7 @@ function runEbookConvert(output) {
     .then(function(options) {
         var cmd = [
             'ebook-convert',
-            path.resolve(outputFolder, 'SUMMARY.html'),
+            path.resolve(outputFolder, SUMMARY_FILE),
             path.resolve(outputFolder, 'index.' + format),
             command.optionsToShellArgs(options)
         ].join(' ');