Allow developers to specify tests through command line

Have this working in Node. Will get on to browser next through some UI. Did this in the following two commit steps:

1. Move all config code to config dir and create a clear droppable directory for tests along with not calling tests suites which creates confusion with benchmark suites. This sets us up to easily allow developers to drop in tests and hand pick the ones to run both through command line and UI

2. Allow developers to specify which tests to run in Node via the command line through a comma separated values of regexes (prefixed with t= or tests=) for good flexibility.