* Add 'yarg' colormap (grayscale white to black). * Clean up docstrings.
* Add 'yarg' colormap (grayscale white to black).
* Clean up docstrings.


ContinuumIO/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco,ContinuumIO/chaco,ContinuumIO/chaco,burnpanck/chaco,tommy-u/chaco,tommy-u/chaco,burnpanck/chaco