Added asynchronous save to GroupManager.setGroup().
Improved efficiency of player checks in /priv list.
Added additional output for failing to find a player with /priv list.
Fixed order of page number parsing for /priv list [user] [page].
Updated to version 1.9.
Updated Bukkit dependency to 1.5.2-R0.1.
Switched to krincraft jenkins.
Added new config flags and corresponding code to config.yml.

users.clean_old is the original user_cleanup flag.
users.clean_after_days is a configurable time period for cleaning
default users.
users.persist_default sets whether default users should be persisted
on first join.
Added /pu clean command to clear default users.
Updated Bukkit dependency to 1.6.2-R0.1.
Merge branch 'master' of http://github.com/krinsdeath/Privileges