Automatically register the references
errr... pdb
add a decorator on events

Replace the subscribing of a consumer:

    on_record_create.subscribe(a_function)

with:

    @on_record_create
    def a_function(...):
Decorator on references. Register the binders, ...

... processors and synchronizers using the decorator.
propagate the keyword arguments to the function in the events decorator
Error message: explain which types are allowed
remove kwargs
add a missing decorator to register a binder
explain a little the Session, small fix in its __init__ and small changes
missing attribute
Merge pull request #3 from guewen/sweeterapi

Better registering of implementations in connectors using decorators