Merge branch 'development': Upgrade of wg-meta-box
Merge branch 'development'
Started working on functionality for adding filter dropdown for taxonomies
* Adds a method for adding previously registered taxonomies
* Adds possibility to add taxonomies as filters for admin screens. Fixes #4
Hides the taxonomy filter dropdowns if they are empty
* Adds a $admin_filter argument for add_taxonomy()
* Made some refactoring and code commenting
Merge branch 'dev/filterable-by-taxonomy' into development:
Implements methods and arguments to add taxonomies as filters on the post type admin list.