v1.1 ARM platform fix

This release is primarily an ARM platform fix to the C++11 atomic use on the master branch. Other changes are:

• WaitforTask clamps the priorityOfLowestToRun_ to be at least as low as the priority of the task waited on to prevent deadlocks
• Added asserts to AddTaskSetToPipe and AddPinnedTask when the task being added is already running
• Init order compile warning fix

v1.0 Version, C++11 master branch and Task Priorities

Version 1.0 of enkiTS brings with it the following changes:

• Task Priorities see readme and the Priorities.cpp example for more information.
• Improved efficiency and performance a tweaked spin wait and new semaphore system for waking tasks help task threads to go to sleep more frequently when not needed and run new tasks faster.
• Master branch now uses C++11. If you were using the C++11 branch I advise switching to master as the C++11 branch will eventually be removed. A C++98 branch exists for those without access to a C++11 compiler or for ease in porting to pure C, though it may be deprecated in time.
• Versioning! From now on I'll be versioning enkiTS