Bugs Fix

This release fixes the following issues:

Fix zeek service not starting after installation: #19
Fix install fails due to Sendmail not configured: #27
Fix install fails with permission denied error: #22
Fix zeek crashes pfSense 2.5.0-rc: https://redmine.pfsense.org/issues/11391
Fix web interface does not display any log content in real time inspection: https://redmine.pfsense.org/issues/11461
Fix Zeek leaves traces after uninstall: https://redmine.pfsense.org/issues/11529

Improvements