Added osgProducer library to the distribution.

Cleaned up the osgproducer demo, and made it work with the new osgProducer lib.

src/osgProducer/Version.cpp

@@ -0,0 +1,12 @@
+#include <osgProducer/Version>
+
+const char* osgProducerGetVersion()
+{
+    return "0.9.2";
+}
+
+
+const char* osgProducerGetLibraryName()
+{
+    return "Open Scene Graph Producer Library";
+}