1.0.8 - Added five other hooks for tabbed pages.
 - Changed the name of the filter for tabbed pages from tab_ + page slug + _ + tab slug to content_ + page slug + _ + tab slug.
 - Removed the check with class_eists() in the class file to let the user do it by themselves. This helps avoid the existent plugins or themes using the library will be affected with breaking changes occurred in version upgrades of the library.