Ignore config files by default in fs.list

lib/generate/fs.js

@@ -30,6 +30,11 @@ var getFiles = function(path) {
         '*.pdf',
         '*.epub',
         '*.mobi',
+
+        // Skip config files
+        '.ignore',
+        '.bookignore',
+        'book.json',
     ], '__custom_stuff');
 
     // Push each file to our list