Removed `#if !NETFX_CORE` from PhotoLoader.cs

• Removed the `#if !NETFX_CORE` conditional compilation from PhotoLoader.cs.
	» This looks like it's intended to exclude some stuff that would only work on Window 8's .NET— but the code within builds and runs fine on Unity 4.5's Mono on OS X.
	» It even interprets `System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyPictures)` as `~/Pictures`.  It just works, as long as your images aren't in a sub-dir and end with the all-uppercase/no-experts-allowed `.JPG` extension.
Added a little more log info for PhotoLoader

• PhotoLoader now logs “PhotoLoader found # images in user's pictures directory.” when it `loadImages()`, on `Start()`.
Added logging when TuioTracking starts/stops listening

It was just a little too silent for me, so I added a bit more logging.  Ideally, this would be Unity-friendly (displays in a custom Unity inspector, and logs only when a static flag is set, which would be settable via that inspector), but eghhk.  This is a start.

• Now logs “TuioTracking started listening on port «port number» (with «library used»).” when TuioTracking is `Start()`ed.
• Now logs “TuioTracking stopped listening on port «port number».” when TuioTracking is `Stop()`ped.