Log Message:
Update to 0.9.4

Changes:

- Remove trailing space from regex we get from plugins.rules (this fix
  a match problem on log entry that didn't contain any space).

- Add --user / --group option to drop privilege. However, make sure it is
  not allowed to open file that the target user can not read, because it
  would lead to failure when trying to re-open the logfile after a rotation.

- Signal handling improvement.

- Fix priority for --quiet option.

- Use newer libprelude IDMEF_LIST_APPEND/IDMEF_LIST_PREPEND addition.

- Add unhandled arguments warning.