Monopoly(r)+Release+3+Player+Buys+Property

As a player, I can buy an unowned property when I land on it during a turn.

User Acceptance Tests

 * Land on a Property that is not owned. After turn, property is owned and balance decreases by cost of property.
 * Land on a Property that I own, nothing happens.
 * Pass over an unowned Property, nothing happens.

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