Add the Cowboy Function Reference

The manual details every stable public functions of Cowboy.

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diff --git a/manual/cowboy_loop_handler.md b/manual/cowboy_loop_handler.md
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+cowboy_loop_handler
+===================
+
+The `cowboy_loop_handler` behaviour defines the interface used
+by HTTP handlers that do not send a response directly, instead
+requiring a receive loop to process Erlang messages.
+
+This interface is best fit for long-polling types of requests.
+
+The `init/3` callback will always be called, followed by zero
+or more calls to `info/3`. The `terminate/3` will always be
+called last.
+
+Types
+-----
+
+None.
+
+Callbacks
+---------
+
+### init({TransportName, ProtocolName}, Req, Opts)
+	-> {loop, Req, State}
+	| {loop, Req, State, hibernate}
+	| {loop, Req, State, Timeout}
+	| {loop, Req, State, Timeout, hibernate}
+	| {shutdown, Req, State}
+
+> Types:
+>  *  TransportName = tcp | ssl | atom()
+>  *  ProtocolName = http | atom()
+>  *  Req = cowboy_req:req()
+>  *  Opts = any()
+>  *  State = any()
+>  *  Timeout = timeout()
+>
+> Initialize the state for this request.
+>
+> This callback will typically be used to register this process
+> to an event manager or a message queue in order to receive
+> the messages the handler wants to process.
+>
+> The receive loop will run for a duration of up to `Timeout`
+> milliseconds after it last received data from the socket,
+> at which point it will stop and send a `204 No Content` reply.
+> By default this value is set to `infinity`. It is recommended
+> to either set this value or ensure by any other mechanism
+> that the handler will be closed after a certain period of
+> inactivity.
+>
+> The `hibernate` option will hibernate the process until it
+> starts receiving messages.
+>
+> The `shutdown` return value can be used to skip the receive
+> loop entirely.
+
+### info(Info, Req, State) -> {ok, Req, State} | {loop, Req, State}
+	| {loop, Req, State, hibernate}
+
+> Types:
+>  *  Info = any()
+>  *  Req = cowboy_req:req()
+>  *  State = any()
+>
+> Handle the Erlang message received.
+>
+> This function will be called every time an Erlang message
+> has been received. The message can be any Erlang term.
+>
+> The `ok` return value can be used to stop the receive loop,
+> typically because a response has been sent.
+>
+> The `hibernate` option will hibernate the process until
+> it receives another message.
+
+### terminate(Reason, Req, State) -> ok
+
+> Types:
+>  *  Reason = {normal, shutdown} | {normal, timeout} | {error, closed} | {error, overflow} | {error, atom()}
+>  *  Req = cowboy_req:req()
+>  *  State = any()
+>
+> Perform any necessary cleanup of the state.
+>
+> This callback will typically unregister from any event manager
+> or message queue it registered to in `init/3`.
+>
+> This callback should release any resource currently in use,
+> clear any active timer and reset the process to its original
+> state, as it might be reused for future requests sent on the
+> same connection.