scaffold.Interpreter spec tests
add lib_managed to .gitignore
fix List[St case
Merge branch 'master' of github.com:twitter/scala_school2
_ can be in var names
Merge pull request #84 from weibohe/master

Fix List[St case in auto-complete
Merge pull request #81 from kamiro/unittests

Unittests
Merge branch 'master' into unittests
Merge remote-tracking branch 'jnievelt/unittests' into unittests
Updated Interpreter unit tests to use TestActorRef.  Updated to create a new instance of an interpreter for every test. Modified the language a bit for easier reading.  Added in placeholder for System.exit test.