Corrected ordering of rows in the k-means heatmap

Prior version incorrectly referenced a dataframe from an earlier slide.
Corrected to use the sample calculated on this slide.
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Merge branch 'master' of git://github.com/jtleek/dataanalysis

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Merge branch 'master' of git://github.com/jtleek/dataanalysis

Conflicts:
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Merge branch 'master' of git://github.com/jtleek/dataanalysis

Conflicts:
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Merge pull request #14 from normgraham/master

Correction to heatmap of k-means data.