New CommandHelper Version & Spigot downgrade

I had to downgrade to a lower version of Spigot as another plug-in was
having problems. Luckily Command Helper didn’t seem too bothered even
with the latest snapshot of CH.
Added GroupManager Library.

This is a better more accurate system for checking groups and users,
this will replace the existing functionality where group and user checks
are. Permission checks will remain inside the CH API usage
'has_permission()'
Fixed some shortfalls with GroupManager Library.

Added a couple of try/catch's to prevent invalid data pollution.