Prototype fix for TLS issues on windows

gh-106 raises some issues with fibers in Windows. The root cause is that
fibers is not finding the v8 TLS origin correctly. This is a new
approach that should be more dependable.
Find thread local slots using v8 isolate pointer

Add __stdcall to correct declaration of find_thread_id().
Then search back in the latest 20 slots for the v8 isolate pointer.
Don't short circuit failed tests

A couple of these tests are less than dependable, so be sure to run all
of them instead of just some of them.
Support for node v0.11.x

Simple wrappers that prefer the new v8 API but support the legacy API as
well. Also improves the build process by adding support for Debug builds
and detects binaries that are broken somehow.
Remove line continuations in Unwrap()

These are leftover from the converted macro. Doesn't affect compilation
at all but is poor style.