New data format: ROOT files
Hi,
I've recently written a tiny python package for loading/saving ROOT files as pandas DataFrames: [root_pandas](https://github.com/ibab/root_pandas).
ROOT is the main data format used by particle physicists.

Do you think it might be worth adding `read_root` and `to_root` functions to pandas itself?
This could convince a lot of physicists to give pandas a try.
The dependencies it would add could be handled like it's currently done with hdf5.

ROOT performs well in comparison with hdf5 and could be a useful addition to pandas, even ignoring the fact that it is very popular in physics.

If there's interest, I would polish my code and create a pull request.
