radians2degrees is deprecated, replaced by rad2deg
Fix 0.2 breakage from 30f947eebbc082b030231700b2823836a52b7c0b
Add handle for deg2rad (fix other 0.2 breakage)
Add AlphaColorValue to encode transparency
Merge pull request #16 from timholy/pull-request/7e47a406

Add RGBA to enable transparency in plots