Merge pull request #1087 from soyersoyer/bs_ts

boost::signals2::connect is thread safe, so the lock is unnecessary

common/src/time_trigger.cpp

@@ -81,7 +81,6 @@ pcl::TimeTrigger::~TimeTrigger ()
 boost::signals2::connection 
 pcl::TimeTrigger::registerCallback (const callback_type& callback)
 {
-  boost::unique_lock<boost::mutex> lock (condition_mutex_);
   return (callbacks_.connect (callback));
 }