Replaced boost facilities with C++ 11 std wherever available

[thiru-mg]

The following have been moved:

1. Boost smart pointers to std smart pointers
2. boost::array to std::array
3. boost::ptr_containers to std::vector<std::unique_ptr
4. BOOST_STATIC_ASSERT to static_assert
5. boost's type_traits to std type_traits

However, the following are not moved:

1. We still use boost::share_ptr in tests because boost test does not accept std::share_ptr yet.
2. Boost's noncopyable is more convenient than =delete copy constructor. So not moving to std there.