Add Resource.init method detection

[Marak]

When using a resource check to see if the resource has a resource.init method. If this method is available on the resource then execute it immediately.

The Resource.init method will be used to indicate the resource requires some asynchronous operation before it can be Resource.start.

In Resource.start it's expected that something will happen ( like starting a service ).
In Resource.init it's expected that nothing outside of initializing the resource will happen.