Mining station redux

I didn't like the way the mining station was split between the two parts
of the asteroid, connected with a bridge, or maybe I just got tired of
seeing the same mining station while everything else changed.
Regardless, I went at it in my own way. Nothing but the mining station
was changed. http://i.imgur.com/FZJ70vP.png
Merge branch 'master' of https://github.com/JacobLee1/UMcS