Add default skel for unit tests. Move test programs to demo.

test/test_node.c

@@ -0,0 +1,13 @@
+/*
+ * Unit test for node.h
+ */
+
+#include "libisofs.h"
+#include "node.h"
+#include "test.h"
+
+void add_node_suite()
+{
+	CU_pSuite pSuite = CU_add_suite("Node Test Suite", NULL, NULL);
+	
+}