GoGo Mount hasn't gotten an update since 7.1.1, and is missing support for all the new 7.2 mounts as well as legion flying.
This addon only adds the extra mounts, you still need GoGo Mount installed to provide any actual functionality.
Thanks to the community from GoGo mount for doing all the actual work of gathering this data, I'm just the one posting it - especially lordofsmeg, Kharum and Xodiv.