[bisq-network/bisq] Added button to export voting history into JSON (#2504)

[benk10]

@ManfredKarrer Fixed all the issues above. Attaching here new screenshot and JSON.
<img width="1312" alt="screen shot 2019-03-06 at 23 40 37" src="https://user-images.githubusercontent.com/10667901/53915792-497a3400-4069-11e9-879e-769cd8e46920.png">

[voteResultsHistory.json.zip](https://github.com/bisq-network/bisq/files/2938409/voteResultsHistory.json.zip)


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