Add get_term_parent shortcut?

[einkoro]

Much like the WordPress API you have to do two calls to get_term() currently to fetch the parent term of a child. Even though WP doesn't have a shortcut for this we could have one since two GET or POST requests is undesirable.

http://wordpress.org/support/topic/added-terms-controller-to-fetch-terms-by-taxonomy-or-post?replies=3#post-4443989

http://stackoverflow.com/questions/14591491/wordpress-get-current-post-term-parent-by-child-id