v0.1.4-alpha

Version 0.1.4-alpha

- Fix a bug where store screens down the trail didn't load properly.
First, the curlandmark had already been incremented, so when we loaded
in the store prices, they were the wrong prices---and because they were off
by one, this meant that the prices were all zeros. Then, the number of oxen
was fluctuating wildly. This was because the calculated total prices for each
of the goods hadn't been initialized to $0, so loading Fort Kearney for example,
it was still trying to adjust for the total prices of goods from Independence.
- Allow user to buy a single ox rather than a yoke of oxen. The game now stores
the oxen as the total count of oxen, rather than the number of yokes.