Improve color naming thresholds

[devongovett]

@majornista pointed out that yellow #ffff00 is described as "very light vibrant yellow green". I realized why this was the case: at lower lightness values, yellow tends to shift toward green. For example, both yellow (#ffff00) and olive (#808000) have the same hue, but olive appears more green. This is a similar effect to what happens between orange and brown. I've fixed this by adjusting the threshold for green to be a bit later, and added a lightness threshold for the green shift similar to what we have for orange/brown.

Also added some additional tests based on CSS named color keywords.

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## API Changes

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