Update bootstrap.js to use new simple API
Update timer test to use new API
Update DNS test to new API
Update fs test to new API
Make monkeypatch test pass
Get events test passing
Make fs test more portable so it can run on linux
Wrap exists as well
Depend on simplified API.
Simplify optional fs wrapping.
The API exported by the glue module is the cls API.

This greatly simplifies things for consumers and will also simplify the
transition to support for cls in core.
tests: (failing) case for error unwinding

How far up the stack do we unwind on a domain fault? How do we kill a
branch of the continuation propagation on error? Do we just reset the
stack?
Fix error test using try..finally
Depend on CLS with cls.createContext().
Incomplete but roughly functional.