Added check for config file existance before attempting to use.
Added better instructions for config file usage.
Add script version numbers.
Check for invalid verbosity levels.
Added GitHub repo info.
Added logging to file.
Added log levels.
Added command line parameter (-v) to set cli log verbosity.
Reworked update download section to account for if latest build is in
progress or failed.
Allowed for script to run as user with restricted sudo access to
stop/start ombi service