ggplot2 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