fact_wrap does not seem to work with coord_trans #151

import plotnine as pn
import plotnine.data as pnd

(pn.ggplot(pnd.mtcars, pn.aes('wt', '..count..'))
 + pn.geom_histogram()
 + pn.facet_wrap('~gear'))

(pn.ggplot(pnd.mtcars, pn.aes('wt', '..count..'))
 + pn.geom_histogram()
 + pn.coord_trans('identity', 'log1p')
 + pn.facet_wrap('~gear'))