tempfile refactoring.

{regular_file,directory}_{in_directory,in_tempdir,from_model}() implementation.
bunsan_tests_project_add_test() usage fix.
asio::block_connection implementation.
asio::basic_object_connection implementation.

asio: binary_object_connection and text_object_connection declaration.
asio::{block,basic_object}_connection::get_io_service() implementation.
asio::serialization::object_connection_coroutine test case refactoring.
asio test suite refactoring.
asio::block_connection bug fix.
asio::basic_object_connection bug fix.
asio: async_result support.
asio::queued_writer implementation.
asio::block_connection::handle_read_header() bug fix.
asio::basic_object_connection bug fix.
asio::queued_writer test suite bug fix.
asio test suite refactoring.

socket_pair_fixture refactoring.
local_socket_fixture declaration.
asio::buffer_connection implementation.
asio::queued_writer::close() refactoring.
asio::buffer_connection::close() refactoring.
asio::queued_writer::terminate() implementation.
asio::buffer_connection::terminate() implementation.