Fixed NullPointerException (console error) with some permission plugins.
v2.1
Added command /ctags player <player> <prefix and suffix> (it automatically saves)
Added command /ctags group <group> <prefix and suffix>
Fixed refresh task not working, added configurable delay
Config nodes for refresh task were changed, but are updated automatically
Improved unique team name generator (previously was made of "CT" plus 7 chars of the prefix and 7 chars of the suffix, now it's "CTAGS" plus the hashcode)
