Code to create a graph on "Uptimes of bridges that were running Jan 2,
2011, 00:00:00 UTC":

 - Generate assignments.csv and statuses.csv using the #2680 code and put
   them in this directory.

 - Compile and run the Java class:
   $ javac StillRunning.java && java StillRunning

 - Run the R code (note that this may take a few minutes!):
   $ R --slave -f still-running-bridges.R

