Allow to specify function signature
Add Byte property
Add bokeh.colors module for color management
Add glyphs/donut example with "web browser market share" plot
Add serialization of Color and remove explicit .toCSS()
Python 3 compatibility of glyphs/donut example
Add major labels to glyphs/donut
Add minor labels to glyphs/donut
Merge pull request #625 from mattpap/donut-chart

Add glyphs/donut example with "web browser market share" plot