Version 0.4.2
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* hues with zero chroma are now defined but are named using the corresponding 
grey (i.e. 5B 0/4 is equivalent to N 0/4) (fixes issue #3)

* fixed slice_complement to display correct colours (issue #2).

Version 0.4.1
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* fixed plot_hex to preserve order of colours (fix courtesy of https://github.com/sebastian-c)

Version 0.4
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* fixed plotting functions to work with new themeing system in ggplot2 0.9.2

Version 0.3
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* put lookup code data in the right place to avoid namespace problems.

Version 0.2
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* added a NAMESPACE and removed package dependencies - colorspace is now
  imported, and ggplot2 is only a suggestion - you don't need it if you're
  using munsell only for colour choice, not for visualising the space.