Bug fixes and whitespace/formatting consistency.

Commit improves formatting and whitespace consistency for reading/editing ease.
Commit fixes jamf/NetSUS#35. Improved OS detection and reporting.
Commit fixes  jamf/NetSUS#29. Execute adminHelper.sh with /bin/bash rather than /bin/sh.
Commit fixes jamf/NetSUS#26. Check on index.sucatalog File Date
Commit fixes jamf/NetSUS#23. Install netatalk dependencies.