Optimize WatchService on OSX and FreeBSD not to use polling mechanism

[Petr Nejedly]

http://stackoverflow.com/questions/9588737/is-java-7-watchservice-slow-for-anyone-else

http://forum.serviio.org/viewtopic.php?f=5&t=18236

[Petr Nejedly]

For 1.5.1 we will use Serviio poller (optimised for only looking for the supported files, media + metadata) instead of the java 7 poller (on Mac and FreeBSD - basically whenever the default service is 'sun.nio.fs.PollingWatchService').

In later versions we should switch to http://jnotify.sourceforge.net/index.html or wait for OSX/Linux JRE to implement native WachtService for OSX and BSD. Note that jnotify doesn't support BSD either (without extensions)

[Christopher Vogt]

there is BarbaryWatchSerivce, which is a drop in replacement with native OSX support