[swf] Log app name and event type for a detected zombie

Refactored to some more OO style to simplify caching of SWF data
(e.g. app name related to the inspected event).

Reason: Today's zombies were reported as "unknown" even though they
should have been detected as "cms" zombie.
Merge pull request #13 from phorsuedzie/log-zombie-type

[swf] Log app name and event type for a detected zombie
Update README.md