Prevent any player from randomly starting the game with a full region

[stevegrossi]

At the start of the game tiles are granted randomly, so there's a small chance that one player would be granted ownership of every tile in a region, and would start the game with the region's bonus, giving them an unreasonable advantage.

There might be several ways to prevent this. Since (for now) all tiles belong to a region, we might loop through each region as we assign tiles, ensuring each region is as evenly divided among players as possible.

[yakryder]

I will start with a quick look at this today

[yakryder]

Looked at this yesterday. Nearly have a failing test, will commit and push when available