It would be nice to see a branch for each version of Minecraft (if possible), i.e. a branch for 1.7, 1.8, 1.9, and master being 1.10, so that we can use the API for mods designed for earlier versions of the game.

Look at Tags, not Branches

Fun fact: they are virtually the same thing!

Wow, I didn't even know Tags existed! Thanks for the clarification!