todo: mark some of the items as inplemented
todo: mark some of the items as inplemented

bitemyapp/ggplot,benslice/ggplot,smblance/ggplot,ricket1978/ggplot,mizzao/ggplot,ricket1978/ggplot,xguse/ggplot,Cophy08/ggplot,udacity/ggplot,andnovar/ggplot,mizzao/ggplot,kmather73/ggplot,assad2012/ggplot,xguse/ggplot,benslice/ggplot,wllmtrng/ggplot,eco32i/ggplot