CRAN release v0.10

CRAN release v0.9

CRAN release v0.8 (close rstudio#562)

CRAN release 0.7

CRAN release 0.6

CRAN release v0.5

CRAN release 0.4

CRAN release 0.3

prepare CRAN version 0.2

CRAN version 0.1