Mutex:  timed lock support fix.

Do not call unlock() in the _waiting function unless the timeout had previously expired.
Read Write Lock:  timed lock support fix.

Do not call unlock() in the _waiting function unless the timeout had previously expired.
Adjust the Mutex timedLock routine to match.
Merge pull request #2 from jordan-ayers/hotfix/mutex-timed-lock

Mutex:  timed lock error.