omit duplicate colors
can you make the plugin more great?
please omit the duplicate colors
see this:
![bicalma sketch 2016-07-14 19-04-44](https://cloud.githubusercontent.com/assets/6332263/16859819/ba7c2386-49f7-11e6-858e-2b1f9c5fc69c.png)
I use the color white to organize my colors in the picker
![monosnap 2016-07-14 19-17-37](https://cloud.githubusercontent.com/assets/6332263/16859823/c37b0330-49f7-11e6-957b-2d78a460f0ae.png)
thanks!
