implemented the basis for the plot-centric functionality, started with the violinplot
improved the violinplot, now it has the boxplots and the correct labeling
restructures the whole file, create a test file, edited the violiplot to allow horizontal plotting
adjusted the multidimensional kde function
expanded the plot-centric available functions with scatter, lines and matrix
added the tests file for the facet plot
some small improvement for compatibility
the facet_plot can capture the environment for the formula analysis
extended the help of facet_plot about the usage of non standard names
improved the counter function, needed to refactor a lot of code
implemented the regular grid of facets
implemented the hist function
implemented the mosaic function
implemented the correlation function
dropped the support for the old style, data-centric functions
corrected a bug in boxplot for integer indexing
implemented the stacking by facet, corrected a bug in the boxplot labeling
extended the tests, corrected issues about dataframe and series
implemented the beautify function to remove the Qs and Is from patsy formulas
moved the test routine, removed old tests