[Global] Minor fixes
[NCuboid] Rename FlagAttribute to Attribute - Fix #138
[NWorld] Fix mobs not passing through portals correctly. - Fix #139
Also add some debug on this
[Global] Add reload commands at least for Messages - Fix #137
* Also change default command for NCuboid from /cuboid to /ncuboid for consistency
* Load messages in a standardized way
* Added all missing messages and permissions
[NWorld] Fix World still loaded after "setEnd" or "setNether" false - Fix #140
* Also fix randomly unloading the main world on setNether(false) (wtf?)
[NCuboid] Entering / Leaving message - Adds #93
* Also renamed some missed variable names and methods from the recent FlagAttribute -> Attribute change
* Changed some Attributes permissions
* Removed default EXPLOSION_BLOCK_DROP=100 for worlds
* Many other little or not so little changes
[Global] Change version to 0.6.2 for release
[Global] Change version to 0.6.3-SNAPSHOT for development
[NCore] Add sources & Javadocs to the Maven repository
[Global] Fix deploying Javadocs and Sources to Maven
+ little JD fix
[Global] Fix #147
[NCuboid] Fix #148
[NCore] Fix #146
[NWorld] Fix #141
[Global] Change version to 0.6.3 for bugfix partial release
[Global] Change version to 0.6.4-SNAPSHOT for development
[NWorld] Throws error when entering portal after setEnd/setNether - false - Fix #141