Error callback being call mutiple times

[parisholley]

If you run more than one query at a time (and say you hit your query limit), the callback is invoked more than once per query, this seems like unexpected behavior. Would recommend updating query.js to use async library

[adamkasprowicz]

This issue is deprecated. Let's focus on our 3 core packages: https://github.com/keen/keen-tracking.js https://github.com/keen/keen-analysis.js https://github.com/keen/keen-dataviz.js