Shifted timed operations implementation from posix_time to chrono. Simplified interfaces
Merge branch 'master' into chrono
More chrono related refactions
Report reason for cv::wait returning
Handle deferred future execution in a cleaner way
Merge branch 'master' into chrono

Conflicts:
	hpx/runtime/threads/detail/set_thread_state.hpp
	src/runtime/threads/executors/thread_pool_executors.cpp
Removed redundant chrono overloads
Add support for std::chrono if available
Touching up latest changes
Touching up recent changes
Merge branch 'chrono'