Scoreboard, worldborder, and rule book

The world is set up for immediate deployment with no problems. My player data has been removed, and all command blocks are running.

## Rule book
* Instructs standard "be nice" / "don't grief"
* Informs about the world border

## World Border
* Set to 200x200
* Will expand to 1000x1000
* Expansion started by pressing button at spawn

## Scoreboard
* Deaths
* Health
* Time played
* Skeletons killed
* Creepers killed