Update 2.9.4

//Changes 2.9.4://
* Fix AssertionError
* AuthMe automatically reconnect to MySQL if session timeout
* Optimize threads
* AuthMe now caching flying status
* AuthMe now apply a fake creative flying status temporary while the
player is not loging in ( force them to do not shake in the air ;) )
* You can now apply the survivalforce only after loging in
* You can now convert FlatFile to SQLite ( /authme flattosqlite )
* Fix Some inventories issues
* Fix some problems with Multiverse-Inventories and MultiInv
* Fix NullPointerExceptions reported
* Fix SaveQuitLocation do not send you to the right pos
* Fix Sessions for multi-servers
* Fix Sessions globally
* Fix maxRegistering
* Fix register API
* Fix DJANGO passwordhashing method ( PBKDF2 )
* Fix do not force registration method
* Add a config to display auto the /motd command from essentials before
the /login ( some bug with some servers )