Git style updates

[oed]

Right now we create a completely new ipfs object each time the document is updated (commit is called). We also link to the previous object CID. It would be cool if each update (commit) only contained the deltas as compared to the previous object, similar to how git is implemented (but we want to utilize IPLD).

We need to research how this could be done in the best possible way using IPLD. Are there any IPFS tools that we can use to do this?