initial commit
added readme
new shape scales, pass R CMD check

- added shape scales from Cleveland 1994
- passes R CMD check without error or warning
added mapping from Stata color names to RGB hex values
added solarized colors
added solarized theme, palette, and color scales
added economist color palettes
smarter solarized_pal. given accent and n, chooses combination that
maximizes distance between colors.
pass R CMD check
updated README
fix link syntax
added theme_stata
lightened background of grid
added example images to README
added examples of Stata and Economist
updates
updates
tweaking
change image heights
make panel grid less noticeable