grid api

why are we hardcoding this in here? won't the python library only consume a single api version at a time?

I sort of feel like the `py` module *is* the definition for the api we're using, no? each call you make in `py` depends on an api call.

Are you just trying to hide this functionality from users? if so, it's already hidden by nature of the `/plotly/` sub-package buffer.