Simple event processing framework.
Changed event posting API.
Updated style.
Changed filter/sink type checks.
Fixed exception inheritance.
Merge github.com:wlanslovenija/nodewatcher into event-processing-proposed
PEP8.
Merge github.com:wlanslovenija/nodewatcher into event-processing-proposed
Merge github.com:wlanslovenija/nodewatcher into event-processing-proposed
Prevent Zen of Python from being output.

This happened because 'this' is a valid Python module that causes
an Easter egg message to be printed.
Made sink/filter registration fully dynamic.
PEP8.
Pass sink configuration to the sink.
Use full sink names.
Use sink class instead of name in get_sink.
Back to flat sink names, but with override possibility.
Shortened get_name method body.
Improved filter API.
Changed test example for filter arguments.
Removed whitespace.