The ability to add, subtract (etc) dataframes with automatic index alignment is one of the great features with Pandas. Currently this is not implemented in DataFrames.jl. I was just wondering if this is intentional?
I was thinking about attempting to create a Pull Request, but the way Pandas implements this (https://github.com/pydata/pandas/blob/master/pandas/core/ops.py#L37) looks pretty intimidating, and I don't know what the corresponding design idiom would be in DataFrames.jl Thanks
