Filter dashboard by topic

[frenchbread]

Closes #10 #11

Changes

• Updated queries and fields to fit emq-plugin-elasticsearch
• Added filterTopic component for filtering data by emq topic
• Added meteor methods:
  • getTopics
  • getEventTypes
• Refactored eventType-filter to use dynamically fetched data, not hardcoded
• Various fixes and cleanups
• Updated README

[frenchbread]

Please review.

[brylie]

Please lint this code using the same ESLint rules as Apinf.

• https://github.com/apinf/platform/blob/develop/.eslintrc
• https://github.com/apinf/platform/blob/develop/package.json#L39-L45

[frenchbread]

Done