v1.2

* Changed: `add_meta_box()` first parameter can be an array with post fields to check against
* Changed: `add_meta_box()` can handle multiple post_types if passed as an array - default is 'any' post type
* Changed: `add_meta_box()` No context needed for core meta boxes
* Changed: `remove_meta_box()` first parameter can be an array with post fields to check against
* Changed: `remove_meta_box()` can handle multiple post_types if passed as an array - default is 'any' post type
* Changed: `remove_meta_box()` No context needed for core meta boxes

Signed-off-by: Ralf Hortt <me@horttcore.de>