The bar graph can now animate changes as well as insert and deletions. Demo of the functionality is in the sample. I will update the documentation on the wiki once the changes are approved, but the usage in the sample is fairly straight forward. Unless the Material design talks I watch tomorrow are completely earth shattering, I'll try and animate line graph by early next month.
I changed the gradle file to look for specific compat library versions because if you're dev environment is set up to use the latest L preview then the v7 + compat libary will evaluate to a 21.x library that will not work when the target sdk is 19.