Django-html5-appcache

- Django 1.6 support

- Add data-appcache optin parameter
- Add HTML5_APPCACHE_EXCLUDE_URL setting
- Fix HTML5_APPCACHE_NETWORK_URL and HTML5_APPCACHE_FALLBACK_URL settings
- Manifest file is now authentication-sensitive (see docs)

- Fix view-generated manifest

- Templatetag added to display cache status
- More tests
- Added security check for sensitive views

- Fixes issues with Google Chrome

- Initial release