HaltException and PassException are Throwables with NoStackTrace.
Filter acceptable bincompat issues in core.
Merge branch '2.2.x_2.9' into 2.2.x_2.10
Merge branch '2.2.x_2.10' into 2.3.x_2.10

Conflicts:
	project/build.scala
Merge branch '2.3.x_2.10' of github.com:/scalatra/scalatra into 2.3.x_2.10