CRAN submission 0.0.8

CRAN 0.0.7 resubmission

ggcorrmat legend changed to account for NAs; CRAN resubmission 0.0.6

CRAN resubmission 2

further modifications to vignettes to pass R CMD checks

prepare for CRAN

ggscatter and ggbetween now use bootstrp to get CI; updated docs acco…

…rdingly

updated README document to remove display problems