fix#446
* The ping_callback option struct is removed.
Actions Required:
* Change call sites which use ping_callback with set_option to
call stream::ping_callback instead.
fix#446
* The write_buffer_size option struct is removed.
Actions Required:
* Change call sites which use write_buffer_size with set_option to
call stream::write_buffer_size instead.
fix#446
* message_type is removed
Actions Required:
* Change call sites which use message_type with set_option
to call stream::binary or stream::text instead.
fix#374, fix#446
* auto_fragment option struct is removed
Actions Required:
* Change call sites which use auto_fragment with set_option
to call stream::auto_fragment instead.
