Hubiquitus loader

This pull request aim to refactor some things about hubiquitus loader :
- DRY hubiquitus and hfactory by adding a specific module hbuiltin.coffee referencing all hubiquitus core modules. This refactoring need  hAdapater to be split in 3 files (Adapter.coffe, InboundAdapter.coffe, OutboundAdpater.coffee)

- Add a mechanism for loading actors, adapters and serializers into subdirectories. In this case  element type  is "subdirectory/type"
Given an Actor topology
````json
{
"actor":"myActor",
"type":"myDirectory/myType"
}
````
the corresponding directories structure in my project is 
````
actors/myDirectory/myType.coffee 
````
- Change lib/actor into lib/actors to match lib/adapters and lib/serializers name.

I can understand if you think that there is too much things into this pull request.
If you are interesting, I can build 2 or three distinct one.
All tests seem to be Ok, but I can't find any test about loader. Do you have something outside the project ?