initial commit
minor readme corrections
ops... forgot to go back and make the mtx_ enum members bitmask-friendly
Reformatted headers; fixed support for OSX (trying to created a timed mutex will fail, however).
Thread work in progress.
Initial version of tweetable Keccak.
Add 'ext/c11threads/' from commit '709b39fcb0c9bc804db10ec677960392b5d93837'

git-subtree-dir: ext/c11threads
git-subtree-mainline: efa0384df4e79d31885a2cdd6ba808dc910c5257
git-subtree-split: 709b39fcb0c9bc804db10ec677960392b5d93837
Changes to build process.
Minor fix to cast in c11threads.h
Erm. Forgot to add a mutex; kcksum_threads.c now works correctly.
Updated count.sh and other build stuff.