The installation process modified the jar, so it seems like this is an
artifact particular to each person's development environment, not
something that should be checked in.
I think this is a reference to the mysql-connector-java library, a jar
for which is already part of the repo. (Technically, it's bad to have
jars in repos, but we'll solve that problem another time.)
When I used Scala 2.7, I got a compiler error "not found: value math."
As far as I can tell, this is because Scala 2.7 doesn't include a
scala.math package (http://www.scala-lang.org/api/2.7.7/). I tried
Scala 2.11.7 instead, and that worked fine.
