See #11 for context...

These are notes (mostly to myself) on how to best implement the proposed additions in the issue linked above:

A global Dispatcher instance should be made available at the package level.
All necessary Dispatcher methods of the global instance should be added as functions at the package level mapping to the instance.
Thread safety needs to be addressed and thought through.
To avoid conflict with a single instance holding all events:
- should event names may need to be name-spaced?
- should an exception be raised in register_event if an event already exists with that name?
Binding to an event that hasn't been registered yet would be nice. Would require caching the callback and event name (shouldn't be too difficult).
Event emission can be done using the global Dispatcher.emit(<name>, ...) method, but exposing the Event instances themselves should be available:
```
import pydispatch
```

Dispatcher.emit() method

pydispatch.register_event('signal_a') pydispatch.emit('signal_a')

Event object method

signal_b = pydispatch.register_event('signal_b') signal_b.emit()