Added makefile to rebuild all shaders for all examples.

examples/makefile

@@ -0,0 +1,15 @@
+#
+# Copyright 2011-2013 Branimir Karadzic. All rights reserved.
+# License: http://www.opensource.org/licenses/BSD-2-Clause
+#
+
+rebuild:
+	@make -s --no-print-directory rebuild -C 01-cubes
+	@make -s --no-print-directory rebuild -C 02-metaballs
+	@make -s --no-print-directory rebuild -C 03-raymarch
+	@make -s --no-print-directory rebuild -C 04-mesh
+	@make -s --no-print-directory rebuild -C 05-instancing
+	@make -s --no-print-directory rebuild -C 06-bump
+	@make -s --no-print-directory rebuild -C 07-callback
+	@make -s --no-print-directory rebuild -C 08-update
+	@make -s --no-print-directory rebuild -C 09-hdr