Added applications directory. Copied (not moved)

osgarchive
    osgconv
    osgdem
    osgversion
    osgviewer

into applications directory.  Leaving them in the examples directory
as well, for now.

Made examples optional via the make COMPILE_EXAMPLES=yes option

Added static lib and static plugin build support.

applications/osgversion/osgversion.cpp

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <osg/Version>
+
+
+int main( int, char **)
+{
+    printf( "%s\n", osgGetVersion() );
+    return 0;
+}