Reorder colors in the random order suggested by Paul Tol.

[yingusxiaous]

Reorder colors in the random order suggested by Paul Toh. #449

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[yingusxiaous]

I signed it!

[wchargin]

Please change the commit title to read "Paul Tol" (note spelling). Also, commit titles do not have a period at the end. (Reasoning and details here.) Besides that, this looks good to me; I can merge it once googlebot is happy.

[googlebot]

CLAs look good, thanks!

[yingusxiaous]

Changed commit message and PR title. Please take a look, thank you!