Proposal: Rename bool() to to_bool()
https://github.com/pandas-dev/pandas/blob/f78b1cc46268e8cee8f5ccdacc41e667a6b92ef7/pandas/core/generic.py#L1371

This method conflicts with python's native `bool`. Wondering if it would be okay to rename this to `to_bool`. 

I can get the needed changes done, but wanted to make sure it's okay before sending out a PR. 