hide cents for ship equipment prices

Seems to work. I kind of winged it, since my lua isn't very strong.

No cents (and proper formating):
![foo1](https://f.cloud.github.com/assets/619390/2522783/4d57b9cc-b4c7-11e3-8855-ae3e0956181f.png)

Still has cents (but now proper formating):
![foo2](https://f.cloud.github.com/assets/619390/2522785/6012ecee-b4c7-11e3-9fce-4c3ca278fb64.png)