Added storage access time watching feature
Fixed thread stop impl
use boost::function and boost::bind instead of template
Modified time_watcher polling thread lib. thread_pool to boost::thread
Added time_watcher_observer
removed old files
Refactored
modified time_watcher id
Modified func name
Added error handling impl
fixed formats
fixed settings names
fixed memory bug
Update a comment
Added headers
Added time_watcher_enabled option
Added time_watcher dtor virtual
Merge branch 'develop' into feature/time_watcher
Added travis dependency
Refactor cluster.cc