changed if x in kwargs to kwargs.setdefault in bar
changed if x in kwargs to kwargs.setdefault in barh
changed if x in kwargs to kwargs.setdefault in boxplot
changed if x in kwargs to kwargs.setdefault in fill_between
changed if x in kwargs to kwargs.setdefault in fill_betweenx
changed if x in kwargs to kwargs.setdefault in hist
changed if x in kwargs to kwargs.setdefault in legend
changed if x in kwargs to kwargs.setdefault in pcolormesh
changed if x in kwargs to kwargs.setdefault in scatter
Merge pull request #30 from olgabot/setdefault

Changed all "if x not in kwargs then set it as this" to kwargs.setdefault(x, ...)