message: Missing header
  The header `<mongocxx/instance.hpp>` its missing on [Mongo CXX 3.0](http://mongocxx.org/mongocxx-v3/tutorial/) driver, when the example is compiled the a **core dump** error is issued. To fix, the `#include <mongocxx/instance.hpp>` was added to the example. The file its on */usr/local/include/mongocxx/v_noabi/mongocxx/instance.hpp*.
diff: @@ -24,6 +24,7 @@ title = "Tutorial for mongocxx"
  #include <mongocxx/client.hpp>
  #include <mongocxx/stdx.hpp>
  #include <mongocxx/uri.hpp>
  +#include <mongocxx/instance.hpp>
  using bsoncxx::builder::stream::close_array;
  using bsoncxx::builder::stream::close_document;
  