ADD a bit of warning about mixins context
ADD method to load module manually

There is now a provided Darwin.Loader.load_module() method.

Its arguments are :

* pathname (String)
* module (jQuery element)

So, to manually load a module from its root element :

    Darwin.Loader.load_module( 'MyNamespace.MyModule', $root )

This has the advantage over instantiating directly controller that
module can be retrieved using `Darwin.Loader.controller()` and will be
automatically destructed when error occurs.
Merge branch 'master' of github.com:oelmekki/darwinjs-rails