Bumping to 2.4.4-SNAPSHOT for development towards the next version
Fixed incorrect detection of "custom" net handlers. 

This should ensure that users on MCPC no longer recieves the 
REPORT_DETECTED_CUSTOM_SERVER_HANDLER warning just for using MCPC.
Added the ability to suppress arbitrary warnings and errors.
Added some debug information when a network manager lacks an address.
Ignore logged out players.
Load JavaScript engine on demand.
Minimize the number of unnecessary references.
Certain packets must be cloned. Document this.
Fixed a memory leak on Spigot that would retain unloaded worlds.
Increment to 2.4.5
Merge branch 'master' into gh-pages
Updating JavaDoc for 2.4.5