fix for NPE on ItemFrameBreak with no item
fixed loglevel cmd
added converter for Art
ExceptionLog wont print stacktrace if the exception is the same as before
also a missing header
fixed NPE when syncing marketsigns
register SignChange Action
display NONE instead of null if description or website is not given
this might fix NPEs
fixed NPE when trying to get role when reloading
debug info when caching the (offline)player in the userbase
removed async PreLogin from Roles
possibly the end to those NPE on CraftOfflinePlayer
Merge commit '89a7634ffe86e11dd84ad72f3f0a8590f603e9be' into stable

	signmarket/src/main/java/de/cubeisland/engine/signmarket/MarketSignFactory.java
fixed Admin Marketsigns syncing without checking the item
fixed signmarket message