BTW: i think it would be helpfull if we would simple take mpl's value for figsize. Now it is strange that 
```
mpl.rcParams["figure.figsize"] = "1, 1"
print ggplot(...)
```

does not result in a changed figsize...

Maybe add a ggplot_figsize(..,...) method? I think seaborn has such helper methods at least for some rcpram setter.