Removed replacing double- with single-quotes in app.info generation. Resolves #40.

src/caterpillar.py

 #!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 
 # Copyright 2015 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
@@ skipping 444 matching lines @@
 
 def add_app_info(output_dir, chrome_app_manifest):
   """Adds an app info script, containing metadata, to a web app.
 
   Args:
     output_dir: Path to web app to add app info script to.
     chrome_app_manifest: Chrome App manifest dictionary.
   """
   logging.debug('Generating app info script.')
   js_manifest = json.dumps(chrome_app_manifest, sort_keys=True, indent=2,
-                           separators=(',', ': ')).replace('"', "'")
+                           separators=(',', ': '))
   app_info_js = ('chrome.caterpillar.manifest = {manifest};\n').format(
       manifest=js_manifest)
   app_info_path = os.path.join(output_dir, INFO_SCRIPT_NAME)
   logging.debug('Writing app info script to `%s`.', app_info_path)
   with open(app_info_path, 'w') as app_info_file:
     app_info_file.write(app_info_js.encode('utf-8'))
 
 
 class InstallationError(Exception):
   """Exception raised when a dependency fails to install."""
@@ skipping 378 matching lines @@
     configuration.generate_and_save(args.output, args.interactive)
 
   elif args.mode == 'convert':
     config = configuration.load(args.config)
     convert_app(args.input, args.output, config, handler.captured_warnings,
                 args.force)
 
 
 if __name__ == '__main__':
   sys.exit(main())