There is a new tool launched by Telsa that will help you with your mount-farm planning and strategy.
You just enter your toon name and realms
Click “View Character” to get the list.
Unfortunately, it does not yet appear to have Warlords of Draenor, but that may be a later addition.
The site is Telsa Mount Farming Planner
So far, it’s helped me a lot with farming the mounts that have eluded me over the years. Curse you Onyxia and Kael!!!