Adding test for patch-caching problem that arose in Tortoise
upgrade to Scala 2.11.4
add comment
Merge pull request #13 from NetLogo/scala-2.11.4

upgrade to Scala 2.11.4
work around apparent silly bug in ScalaTest

fixes NetLogo/NetLogo #668 (but here in the NetLogoHeadless repo;
not sure if the problem has been observed in the other repo)
Merge branch 'master' into wip-mitosis-mark-two