Added the `tinycolor2` lib that returns a boolean indicating whether the 
perceived color brightness of the bubble chart is light by changing the color 
of the text to black or white.

### Before:

![screenshot from 2018-09-28 
08-45-34](https://user-images.githubusercontent.com/1894191/46228562-cb3a9880-c338-11e8-8a64-c1c2f72be572.png)

### After:

![screenshot from 2018-09-28 
08-45-08](https://user-images.githubusercontent.com/1894191/46228575-d2fa3d00-c338-11e8-8e1f-fd27503e3a22.png)


[ Full content available at: https://github.com/apache/drat/pull/171 ]
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