BUG: 'bone' colormap is the same as 'gray'
BUG: 'bone' colormap is the same as 'gray'

This changes the 'bone' colormap to be the same as its counterpart
in Matplotlib and MATLAB. The color data are from Matplotlib.

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