Fix deprecation warnings in the demos.

demos/gstreamer/helloworld/gstreamer_helloworld.d

@@ -116,7 +116,7 @@ int main(string[] args)
 
 	writefln("Checking version of GStreamer...");
 
-	GStreamer.versio(major, minor, micro, nano);
+	GStreamer.version_(major, minor, micro, nano);
 
 	writefln("The installed version of GStreamer is %s.%s.%s", major, minor, micro );
 	writefln( "The file is: %s", args[1] );

demos/gstreamer/mediaplayer/gst_mediaplayer.d

@@ -212,10 +212,10 @@ public:
 		if( source !is null )
 		{
 			fullStop();
-			delete source;
+			source.destroy();
 		}
 		if( videosink !is null )
-			delete videosink;
+			videosink.destroy();
 	
 		// create elements
 

demos/gtk/SpawnTests.d

@@ -78,7 +78,7 @@ class SpawnWindow : ApplicationWindow
 
 	private bool exec(string[] args)
 	{
-		foreach ( int i, string arg ; args)
+		foreach ( size_t i, string arg ; args)
 		{
 			writefln("[%s] >%s<", i, arg);
 		}
@@ -141,7 +141,7 @@ class SpawnWindow : ApplicationWindow
 	{
 		TextBuffer inBuffer = viewInput.getBuffer();
 		string t;
-		foreach ( int count, string arg; args)
+		foreach ( size_t count, string arg; args)
 		{
 			if ( count > 0 ) t ~= " ";
 			t ~= arg;