Nunu & Willump Skills for Mid Path 14.23

Optimal Nunu & Willump skill order for the Mid path in patch 14.23, customized for the current LoL meta.
Nunu & Willump
Nunu & Willump the Boy and His Yeti
Call of the Freljord Consume Q Biggest Snowball Ever! W Snowball Barrage E Absolute Zero R