- Adds 'std=c++11' compiler flags
- Replaces boost::type_traits with std::type_traits
- Replaces boost::shared_ptr with std::shared_ptr
- Replaces std::auto_ptr with std::unique_ptr
- Replaces raw pointers with std::unique_ptr in ptr_vector, ptr_stack, and SettingChanges
- Replaces boost::noncopyable with deleted copy and assignment operators
- Replaces boost::next with std::next
- Replaces boost::enable_if with std::enable_if
- Replaces boost::is_convertible with std::is_convertible
- Replaces ptrdiff_t with std::ptrdiff_t
- Replaces boost::iterator_facade and boost::iterator_adaptor with std::iterator, borrowing the 'proxy reference' technique from boost
- Removes Boost dependency from CMakeLists
- Formats changed files using clang-format
