initial file observer setup
API update
implementation with Apache Commons IO Library
observation test client
file observer ready to use
FileObserverMenu for ConsoleClient implemented
remove now unnecessary interfaces and event classes
ConsoleClient file observer now supports automatic file add/remove
Merge branch 'file-observer'

Conflicts:
	org.hive2hive.client/src/org/hive2hive/client/menu/TopLevelMenu.java