yhat/ggplot — pull request #271 by has2k1 (2014-04-09 11:13:14+00:00)
Title: Change legend and handle fill and alpha mapping

- legends nolonger added to ggplot object
- fill aesthetic mapping implemented
- alpha aesthetic mapping implemented
- moved legend code from ggplot.py to legend.py
- ':::*_mapping:::' hack to avoid collisions

closes #270