I've done a lot of changes to make it work with save_post trigger and Wordpress 3.6

Please review my commits. I've changed it a lot due to fix indents. I've also upgraded it to be able to use with Wordpress 3.6. I found the problem with my custom walkers when using the previous voce-cached-nav version.

The big changes are:
- be able to be triggered by save_post properly (clear cache when save_post)
- be able to use with Wordpress 3.6

If the changes are ok, I suggest to change plugin version and update README :D

Any questions, please let me know.

Natty