[GitHub] [incubator-superset] kristw opened pull request #5704: Refactor and update heatmap

[GitHub]

- Extract `slice` and `formData` according to [SIP-5]
- Fix small issues and syntax inside heatmap.
- Move legend to the right
- Make axis labels align to the ticks

![image](https://user-images.githubusercontent.com/1659771/44495802-52a03800-a626-11e8-81e2-fe26732085df.png)
 

[ Full content available at: 
https://github.com/apache/incubator-superset/pull/5704 ]
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