Add support for multi-value variables#59

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PhracturedBlue wants to merge 1 commit intoJamesOsgood:masterfrom

PhracturedBlue:multi_value

Commits on Jun 1, 2019

Add support for multi-value variables based on https://github.com/grafana/grafana/blob/v5.0.4/public/app/plugins/datasource/postgres/datasource.ts#L16-L33
PhracturedBlue
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