README.md update.
Change version number to 'develop' in this branch.
burn, cpuburn-m, mprime: Don't trap when there's only one instance running.
(This avoids the 'need to specify whom to kill' message.)
Typo fix in readme.
Updated kernel to 3.8.10.
Updated kernel to 3.8.11.
Add 'nonfree.txt' and clarify licenses.
Update documentation and scripts for CPUstress v2.3.2.