BDay offset behaviour vs docs & implementation
apologies if this has already been raised but couldn't find an answer.

from the docs : 

DateOffsets can be created to move dates forward a given number of valid dates.  For example, Bday(2) can be added to a date to move it two business days forward.  If the date does not start on a valid date, first it is moved to a valid date. 

pd.Timestamp('20150830')+BDay(0) == pd.Timestamp('20150830')+BDay(1)  is True

it doesn't move it first to a valid date and the code seem to confirm that. not sure what's the intended behaviour here but would be great to clarify. thanks in advance.
