Moved config files to /config.

As a mentioned idea here in https://groups.google.com/forum/#!topic/partialjs/jM5mLbj1zV0, moved config files to /config.
A further commit may also renamed the config files as;
/config/release
/config/debug

As I'm pretty new to node.js and partial.js, I'm not sure if the code changes are all okay, because I didn't know how to run the tests on empty-project.