Tags: cjhdev/wic

0.2.1 updates

0.2.0 update

- added `wic_on_buffer_fn` callback for allocating a transmit buffer
  and indicating when socket is not able to buffer
- added buffer type field to `wic_on_buffer_fn` and `wic_on_send_fn`
  to support buffer prioritisation (i.e. so a pong doesn't disappear)
- added `wic_on_handshake_failure_fn` callback to indicate a failed
handshake
- added `wic_on_close_transport_fn` callback as a dedicated handler for
  closing the transport
- added `wic_on_ping_fn` callback
- added `wic_on_pong_fn` callback
- removed `wic_send_pong*` interfaces
- changed URL schema to be an enum rather than string
- added mbed port work in progress
- fixed the echo example (was previously closing prematurely)

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