Added INCLUDE_xSemaphoreGetMutexHolder() default.

Added INCLUDE_xSemaphoreGetMutexHolder() default.
Changed eTaskStateGet() to eTaskGetState() and added #define to ensure backward compatibility.
Added configEXPECTED_IDLE_TIME_BEFORE_SLEEP definition - was previously hard coded to 2.
Slight change to the default CM3 tickless sleep function to allow the idle time to be set to zero in the pre-sleep processing macro.
Changed stack alignment for the FreeRTOS-MPU port to ensure it didn't trigger the assert() in the generic create function.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@1815 1d2547de-c912-0410-9cb9-b8ca96c0e9e2