+ Added xTaskCatchUpTicks() which corrects the tick count value after the application code has held interrupts disabled for an extended period.
+ Updated the xTaskResumeAll() implementation so it uses the new xTaskCatchUpTicks() function mentioned above to unwind ticks that were pended while the scheduler was suspended.
+ Various maintenance on the message buffer, stream buffer and abort delay demos.
+ Change type of uxPendedTicks from UBaseType_t to TickType_t to ensure it has same type as variables it is compared to, and therefore also rename the variable xPendingTicks.
+ Correct spelling mistake within a comment that was common to all the ARMv7-M ports.
Links to a documentation page for each demo are provided on the following
URL: http://www.freertos.org/a00090.html
Each RTOS port has a demo application to demonstrate it's use.
+ The Demo/Common directory contains the demo application files as described on
the http://www.FreeRTOS.org WEB site. Each file creates one or more tasks.
The files in the Demo/Common directory are used by every demo application for
every port.
+ All the other directories contain a project or makefile for the demo
application targeted at a particular microcontroller.
For example, if you are interested in the ATMega323 demo application for
the WinAVR tools then the AVR_ATMega323_WinAVR directory contains the
relevant makefile. The makefile includes files from the Demo/ATMega323
and the Demo/Common directories. If this is the only port you are
interested in then all the other directories can be ignored.
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