Version 0.5.2
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* Fixed an error in axis drawing in the desnity tour

* Fixed the calculate of lda_pp when projection dimension is 1

* Changed explanation of proj_dist function

* fix missing export for `proj_dist`

Version 0.5.1
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* minor example fix for ggplot2 0.9 compatibility

* try using `dev.hold()` and `dev.flush()` to see if it improves drawing
  performance. It doesn't seem to on quartz devices.

* `display_density` correctly displays axis labels

Version 0.5
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* `cm` was renamed to `cmass`; the dataset sleep was removed

Version 0.4.1
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* `search_geodesic` was passing the wrong parameter to `find_best_dir` causing
  it to search very far away instead of very close, and negatively impacting
  performance (thanks to Mohit Dayal for reporting the bug)

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