11phpwarnings

- fixed PHP Warning:  Missing argument 2 for
WPTokenManager::custom_nav_items()
- added option to turn off global tokens (off by default)

*This option is available on WP sites except main site and is turned off by default - which means all sites will not be using the main site's tokens if not enabled.*
![globaltoken](https://cloud.githubusercontent.com/assets/2107541/3823907/bfa087da-1d3f-11e4-8a0d-140679325ee3.jpg)