Add features

Version 0.6.2

This is a modest upgrade to the initial release, adding a number of features.

• corrected small bugs in ggbiplot() and ggscreeplot()`
• reflect() now also reflects supplementary variables from FactoMineR::PCA()
• added support for ade4::dudi.pca()
• ggbiplot() gains an axis.title argument
• ggscreeplot() gains color, shape, linetype and linewidth arguments
• Added get_SVD() intended the simplify the interface to various PCA functions.
• Now use get_SVD() in ggbiplot() and ggscreeplot()
• Extend some examples, requiring Depends:ggplot2

v. 0.6-1 release to CRAN

Initial release to CRAN comprising work since the old 0.55

Version 0.6.1

• Revised documentation for ggscreeplot()
• data(crime) used in README giving a more complete example.
• Fixed links reported as 301s
• Published pkgdown site

Version 0.6.0

• Use geom_polygon() rather than geom_path() for ellipses to allow them to be filled.
• Added var.factor argument to expand or reflect the variable vectors
• Moved points/labels code earlier so ellipses and variable vectors are not obscured
• Replaced internal calculation of ellipses with stat_ellipse()
• Now allow ellipses to be filled (geom_polygon()) or unfilled (geom_path())
• Added hex logo
• Added iris example to README
• Removed Imports: dplyr, purrr as no longer needed