* Changes cancel_on_connection_lost default to false
* Deprecates cancel_on_connection_lost and cancel_if_not_connected
* Fixes a TODO in test_conn_exec_cancel
close#323
* Adds support for asio::cancel_after in connection::{async_exec, async_run}
* Adds cancel_after tests
* Adds an example on using asio::cancel_after
* Adds a discussion page on timeouts and the `cancel_if_unresponded` flag
close#226