Provide installable man pages

make docs: generate Markdown and man pages in doc/
make install-docs: install man pages to be usable directly

Docs are generated from the ezdoc files in doc/src/.

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+::: The Websocket protocol
+
+This chapter explains what Websocket is and why it is
+a vital component of soft realtime Web applications.
+
+:: Description
+
+Websocket is an extension to HTTP that emulates plain TCP
+connections between the client, typically a Web browser,
+and the server. It uses the HTTP Upgrade mechanism to
+establish the connection.
+
+Websocket connections are asynchronous, unlike HTTP. This
+means that not only can the client send frames to the server
+at any time, but the server can also send frames to the client
+without the client initiating anything other than the
+Websocket connection itself. This allows the server to push
+data to the client directly.
+
+Websocket is an IETF standard. Cowboy supports the standard
+and all drafts that were previously implemented by browsers,
+excluding the initial flawed draft sometimes known as
+"version 0".
+
+:: Implementation
+
+Cowboy implements Websocket as a protocol upgrade. Once the
+upgrade is performed from the `init/3` callback, Cowboy
+switches to Websocket. Please consult the next chapter for
+more information on initiating and handling Websocket
+connections.
+
+The implementation of Websocket in Cowboy is validated using
+the Autobahn test suite, which is an extensive suite of tests
+covering all aspects of the protocol. Cowboy passes the
+suite with 100% success, including all optional tests.
+
+Cowboy's Websocket implementation also includes the
+x-webkit-deflate-frame compression draft which is being used
+by some browsers to reduce the size of data being transmitted.
+Cowboy will automatically use compression as long as the
+`compress` protocol option is set when starting the listener.