v0.8.5.5

This is a minor maintenance release, focusing on usability improvements.
Main changes:

• multiple scripts: check for valid geoblocking mode (either whitelist or blacklist)
• multiple scripts: display "usage" info when unrecognized action had been specified
• multiple scripts: improved and updated the usage() function output
• multiple scripts: fine-tuned which errors get into the syslog and which not
• validate_cron_schedule.sh: improved guidance in error messages when schedule validation fails
• some code cleanup
• updated readme

Full Changelog: v0.8.5.4...v0.8.5.5