Add EventHandler javadoc

There was no informations for priority() and ignoreCancelled() method
Update EventHandler Javadoc
Missing Monitor
change definition - remove white space
Otherwise...
Need to learn my english lessons...
Merge #11

Thanks @Xephi

commit 9465cbe1e272b8200b254d44e47efc4b186b8bf9
Author: Xephi
Date:   2013-03-21 03:46:10 +0100

Need to learn my english lessons...

commit da722b8f959158301daab4094cb0f42f68550439
Author: Xephi
Date:   2013-03-21 03:11:23 +0100

Otherwise...

commit f915d3aa928db73bcce800eb03d65976a8d404f4
Author: Xephi
Date:   2013-03-21 03:09:16 +0100

change definition - remove white space

commit 60f58fefc5a707e7157b445f51e33f12fa1b2840
Author: Xephi
Date:   2013-03-21 03:00:56 +0100

Missing Monitor

commit 16b8a06de42835494c8ab5802638273578cff22f
Author: Xephi
Date:   2013-03-21 02:56:47 +0100

Update EventHandler Javadoc

commit 7ce975d168faac78e5ef2acbb57c504a5f2c7871
Author: Xephi
Date:   2013-03-21 02:29:03 +0100

Add EventHandler javadoc

There was no informations for priority() and ignoreCancelled() method