BUG: make sure fig is not doubled when passing by to series.hist
closes #4112.

@jreback any issues here?
 if this isn't a critical bug then i would suggest we wait to _really_ fix the issue here in 0.13
 is kind of hacky...up 2 u
 k let's wait then. if anyone raises a bug then can show them how to put it into a frame and do ti
 closing...i'll raise an issue.
 Reopening because the plotting API will take some time to fix and double figures should not be happening in the meantime
 @jreback ok 2 merge?
 sure...if you think ready...i don't really get into the plotting too much
 alright let me put it through the ringer with some of my god-awful plotting code and see if i find any edge cases
