Adding support for the 'other' Tufte boxplot as an option to geom-tufteboxplot. This also replaces the 'usebox' option with a new 'median.type' option that can toggle the median being represented as a point (default, median.type='point'), a box (the old 'usebox=TRUE', median.type='box') or a line (median.type='line').
Adjusting the width of the horizontal lines that in median.type='line' so they match up beter.
Added new option for geom_tufteplot

- Fixes #13, #19

Merge branch 'master' of https://github.com/weitzner/ggthemes into weitzner-master

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added Rstudio project