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

As a player, I can mortgage a property during my turn.

User Acceptance Tests

 * Player mortgaged property. Their balance increases by 90% of the original purchase price (always rounded down.
 * Player tires to mortgage property that is already mortgaged. Fails.
 * Player tires to mortgage property that is not owned. Fails.
 * Player tries to mortgage property that they do not own. Fails.

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