Added loading of phpjs md5 in example.
Minor update to example to demonstrate 'destroyThreadPool.' Added clustering benchmark (this only works on Linux/Mac due to Node limitations). Updated the threadpool to use the appropriate native thread calls for Windows.  Since the threadpool is using CRT calls, necessary to use a specific set of thread functions.
Merge branch 'experimental' of https://github.com/inh3/nPool into experimental
Merge pull request #3 from inh3/experimental

Windows native thread function update.