Scoreboards

This PR is the same as #340, except it's against master.

This merges cleanly, if @SpaceManiac wants it merged into `master` instead of `scoreboards`

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*Edited by turt2live*

**Related Links:**
- Glowkit: GlowstoneMC/Glowkit#35
- Ticket: #81 
What needs to be done with them?