[GitHub] [incubator-superset] mistercrunch opened pull request #5712: [deck polygon] add support for geohash

[GitHub]

### improvements:
* added autozoom support
* support for metric & aggregations (only aggregates if metric is picked)
* fixed stroke
* fixed opacity
* introduced a SliderControl

![gb0fx9gddw](https://user-images.githubusercontent.com/487433/44538991-cb9ba000-a6b7-11e8-998e-20118ea6cf12.gif)
<img width="718" alt="screen shot 2018-08-23 at 9 35 25 am" 
src="https://user-images.githubusercontent.com/487433/44539025-ecfc8c00-a6b7-11e8-8296-5cd607df6a2e.png";>



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https://github.com/apache/incubator-superset/pull/5712 ]
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