Add the ability to serve the blog locally for review.

I have added a quick and easy way to view the blog locally before posting it to the Web. Hopefully this will help with developing themes for Tinkerer, as well as, give us an opportunity to check out posts prior to uploading them. I have added unit tests to verify that the server is pulling posts as expected.

Thank you for your work on Tinkerer. It is great software and I have quite enjoyed hacking on it.