Arbor.js Changes
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Version 0.92 | 19 jun 2011
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  * Creating nodes with an initial x/y or fixed position now works as advertised

  * Calling ParticleSystem's .screen() method without arguments will now 
    return an object with fields describing the current screen state

  * Fix for problems on chrome when running from file:// urls
  
  * Added a shell script to run a local http server so the demos will work without
    needing to be hosted somewhere

Version 0.91 | 17 jan 2011
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  * Now supplementing brute-force repulsion calculations with the more-efficient
    (but noisier) barnes-hut algorithm. Use the ParticleSystem's .precision
    parameter to control the accuracy/speed trade-off.


Version 0.9 | 12 jan 2011
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  * Initial release