The Theories runner does not anticipate theory parameters that have generic types, as reported by github#64. Fixing this won't happen until Theories is moved to junit-contrib. In anticipation of this, 4.9.1 adds some of the necessary machinery to the runner classes, and deprecates a method that only the Theories runner uses, FrameworkMethod#producesType(). The Common Public License that JUnit is released under is now included in the source repository.
Thanks to @pholser for identifying a potential resolution for github#64 and initiating work on it.