R 개발 모드 설정

install.packages("devtools")

library(devtools)

dev_mode(on=T)

install_github("hadley/ggplot2")

# use dev ggplot2 now

# when finished do:

dev_mode(on=F)  #and you are back to having stable ggplot2

ref: http://stackoverflow.com/questions/9656016/how-to-install-development-version-of-r-packages-github-repository

happy hackin'