stat_summary ignores geom aesthetics when used with median function

[gokceneraslan]

qplot(cyl, mpg, data=mtcars) + stat_summary(fun.y=median, colour="red", geom='point', size = 3)

example is no longer reproducible on master branch. It gives a warning:

Warning message:
Computation failed in `stat_summary()`:
unused arguments (colour = "red", size = 3) 

and does not plot geom_point. On the other hand, it works properly when the mean function is supplied:

qplot(cyl, mpg, data=mtcars) + stat_summary(fun.y=mean, colour="red", geom='point', size = 3)

[gokceneraslan]

Thanks!