Intermittent NPE parsing routes

[rossabaker]

Since porting to sbt-0.10, tests are failing intermittently:

[info] Caused by: org.eclipse.jetty.servlet.ServletHolder$1: java.lang.NullPointerException
[info]  at org.eclipse.jetty.servlet.ServletHolder.makeUnavailable(ServletHolder.java:408)
[info]  at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:454)
...
[info] Caused by: java.lang.NullPointerException
[info]  at scala.util.parsing.combinator.Parsers$NoSuccess.<init>(Parsers.scala:132)
[info]  at scala.util.parsing.combinator.Parsers$Failure.<init>(Parsers.scala:159)
[info]  at scala.util.parsing.combinator.RegexParsers$$anon$2.apply(RegexParsers.scala:67)

sbt-0.10 runs tests in parallel. This smells like thread-unsafe parsers.