Merge pull request #4 from nattyait/master

voce_cached_nav_menu return NULL
Merge pull request #5 from nattyait/master

I've done a lot of changes to make it work with save_post trigger and Wordpress 3.6
merge and format 3.6 pull request
fix undefined var
Merge branch 'master' of github.com:voceconnect/voce-cached-nav