Adds mining equipment vendor to mining dock

Before:
![ss 2014-10-07 at 12 18 02](https://cloud.githubusercontent.com/assets/7247232/4538578/1bb2e986-4df2-11e4-9aa0-78c7237fb29c.png)
After:
![ss 2014-10-07 at 12 16 51](https://cloud.githubusercontent.com/assets/7247232/4538579/1c8d077e-4df2-11e4-9f61-752c4396ec8a.png)

I don't want to go all the way to mining to purchase my cool toys after bringing stuff back to the station and nobody else does either