Added messages to CMSIS RTOS, added demo for the STM32F407.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7383 35acf78f-673a-0410-8e92-d51de3d6d3f4
Improved demo.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7384 35acf78f-673a-0410-8e92-d51de3d6d3f4