gginnards 0.0.2

This is a minor update, with the following enhancements compared to ‘gginnards’ 0.0.1.

• Implement str() method for class "ggplot" as a wrapper with tweaked default arguments.
• Add functions mapped_vars() and data_vars() to list variables in the default data member of objects of class "gg".
• Add function data_attributes() to list the attributes of the default data member of objects of class "gg".

Documentation web site at http://docs.r4photobiology.info/gginnards/ includes all help pages, with output from all examples, and vignettes in HTML format.
NOTE: The package is on its way to CRAN CRAN.

Please raise issues concerning bugs or enhancements to this package through Bitbucket https://bitbucket.org/aphalo/gginnards/issues