Seperate Child Db Server

For Issue  #14:

* Spawns db.js and opens ports 3000,4000,5000 for each db with multilevel
* Parent sends the child the settings to get the settings.path

NOTES: 
* Haven't had experience with the Async Module, so refactoring might take a while on my part.

convention is for callbacks to be the last parameter, so
function checkPath(result, done)

In this context, "result" is also not very clear, and suggests that there might be a better name for it.