0.4.0 (Feb 2014)
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* Preliminary work on Matplotlib support: convert MPL figures to Bokeh plots
* Tool improvements:

  - "always on" pan tool and wheel zoom tool
  - box zoom tool
  - viewport reset tool

* Enhanced datetime axis, with better performance and nicer ticking
* Expanded testing, including TravisCI integrations and static image output using PhantomJS
* RGBA and color mapped image plots now available from Python
* Python 3 support!
* Vastly improved documentation for glyphs, with inline examples and JSFiddle integration
