Prepare 0.2.7 release: update DESCRIPTION, vignette, and cran-comments

Release 0.2.6: CRAN accepted version

Add extras to .Rbuildignore to address CRAN requirements

Update CRAN comments for v0.2.4

Documentation tweak

Update pkgdown site for version 0.2.2

Another attempt to update website

Update pkgdown site for v0.2.0

Update example plot

Change examples from dontrun to donttest