Switching controller_manager controllers_lock_ to be a recursive lock
Removing getControllerByNameImpl
Fixing doc errors in PID
Merge pull request #25 from jbohren-forks/inline-doc

Fixing doc errors in PID
Merge pull request #24 from jbohren-forks/fix-controllers-rlock

Alternative fix to getControllersByName mutex-locking requirements
Adding explicit header for recursive mutex