More Detailed End-Round Report

![screenshot 2014-08-29 21 15 38](https://cloud.githubusercontent.com/assets/3828067/4098010/3a3ba6c4-2ff5-11e4-8523-39285d03e061.png)

End-Round report will now declare some round statistics, including
-Round duration
-Station integrity
-Total population
-Survival Rate
-Evacuation Rate
-Command's Approval Rating (During rev only)

Bugfix:
-Ending the round as a brain will no longer report to the player that they have survived

I stuck with round-wide statistics instead of tracking every little thing, mostly to keep things simple.