Version 0.4
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* move ggplot2 from depends to suggests
* add CITATION to JSS paper

Version 0.3.1
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* export `find_platform` function

Version 0.3
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* small fixes for compatibility with the tourrGui package.

tourr 0.2.1
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* change documentation file name for `nul` to avoid problems in Windows 7
  (thanks to Brian Ripley)

tourr 0.2 
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* many bug fixes in tour algorithms, interpolation and history saving

* `animate` now invisibly returns the bases it displayed when it terminates

* `tourr` now has better NAMESPACE so should play better with other packages

* `display_xy` and `display_dist` do a better at guessing the display
  range

* new `display_trails` rendering

* `display_dist` gains a rug option