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 modern Web
-==============
-
-Let's take a look at various technologies from the beginnings
-of the Web up to this day, and get a preview of what's
-coming next.
-
-Cowboy is compatible with all the technology cited in this
-chapter except of course HTTP/2.0 which has no implementation
-in the wild at the time of writing.
-
-The prehistoric Web
--------------------
-
-HTTP was initially created to serve HTML pages and only
-had the GET method for retrieving them. This initial
-version is documented and is sometimes called HTTP/0.9.
-HTTP/1.0 defined the GET, HEAD and POST methods, and
-was able to send data with POST requests.
-
-HTTP/1.0 works in a very simple way. A TCP connection
-is first established to the server. Then a request is
-sent. Then the server sends a response back and closes
-the connection.
-
-Suffice to say, HTTP/1.0 is not very efficient. Opening
-a TCP connection takes some time, and pages containing
-many assets load much slower than they could because of
-this.
-
-Most improvements done in recent years focused on reducing
-this load time and reducing the latency of the requests.
-
-HTTP/1.1
---------
-
-HTTP/1.1 quickly followed and added a keep-alive mechanism
-to allow using the same connection for many requests, as
-well as streaming capabilities, allowing an endpoint to send
-a body in well defined chunks.
-
-HTTP/1.1 defines the OPTIONS, GET, HEAD, POST, PUT, DELETE,
-TRACE and CONNECT methods. The PATCH method was added in more
-recent years. It also improves the caching capabilities with
-the introduction of many headers.
-
-HTTP/1.1 still works like HTTP/1.0 does, except the connection
-can be kept alive for subsequent requests. This however allows
-clients to perform what is called as pipelining: sending many
-requests in a row, and then processing the responses which will
-be received in the same order as the requests.
-
-REST
-----
-
-The design of HTTP/1.1 was influenced by the REST architectural
-style. REST, or REpresentational State Transfer, is a style of
-architecture for loosely connected distributed systems.
-
-REST defines constraints that systems must obey to in order to
-be RESTful. A system which doesn't follow all the constraints
-cannot be considered RESTful.
-
-REST is a client-server architecture with a clean separation
-of concerns between the client and the server. They communicate
-by referencing resources. Resources can be identified, but
-also manipulated. A resource representation has a media type
-and information about whether it can be cached and how. Hypermedia
-determines how resources are related and how they can be used.
-REST is also stateless. All requests contain the complete
-information necessary to perform the action.
-
-HTTP/1.1 defines all the methods, headers and semantics required
-to implement RESTful systems.
-
-REST is most often used when designing web application APIs
-which are generally meant to be used by executable code directly.
-
-XmlHttpRequest
---------------
-
-Also know as AJAX, this technology allows Javascript code running
-on a web page to perform asynchronous requests to the server.
-This is what started the move from static websites to dynamic
-web applications.
-
-XmlHttpRequest still performs HTTP requests under the hood,
-and then waits for a response, but the Javascript code can
-continue to run until the response arrives. It will then receive
-the response through a callback previously defined.
-
-This is of course still requests initiated by the client,
-the server still had no way of pushing data to the client
-on its own, so new technology appeared to allow that.
-
-Long-polling
-------------
-
-Polling was a technique used to overcome the fact that the server
-cannot push data directly to the client. Therefore the client had
-to repeatedly create a connection, make a request, get a response,
-then try again a few seconds later. This is overly expensive and
-adds an additional delay before the client receives the data.
-
-Polling was necessary to implement message queues and other
-similar mechanisms, where a user must be informed of something
-when it happens, rather than when he refreshes the page next.
-A typical example would be a chat application.
-
-Long-polling was created to reduce the server load by creating
-less connections, but also to improve latency by getting the
-response back to the client as soon as it becomes available
-on the server.
-
-Long-polling works in a similar manner to polling, except the
-request will not get a response immediately. Instead the server
-leaves it open until it has a response to send. After getting
-the response, the client creates a new request and gets back
-to waiting.
-
-You probably guessed by now that long-polling is a hack, and
-like most hacks it can suffer from unforeseen issues, in this
-case it doesn't always play well with proxies.
-
-HTML5
------
-
-HTML5 is, of course, the HTML version after HTML4. But HTML5
-emerged to solve a specific problem: dynamic web applications.
-
-HTML was initially created to write web pages which compose
-a website. But soon people and companies wanted to use HTML
-to write more and more complex websites, eventually known as
-web applications. They are for example your news reader, your
-email client in the browser, or your video streaming website.
-
-Because HTML wasn't enough, they started using proprietary
-solutions, often implemented using plug-ins. This wasn't
-perfect of course, but worked well enough for most people.
-
-However, the needs for a standard solution eventually became
-apparent. The browser needed to be able to play media natively.
-It needed to be able to draw anything. It needed an efficient
-way of streaming events to the server, but also receiving
-events from the server.
-
-The solution went on to become HTML5. At the time of writing
-it is being standardized.
-
-EventSource
------------
-
-EventSource, sometimes also called Server-Sent Events, is a
-technology allowing servers to push data to HTML5 applications.
-
-EventSource is one-way communication channel from the server
-to the client. The client has no means to talk to the server
-other than by using HTTP requests.
-
-It consists of a Javascript object allowing setting up an
-EventSource connection to the server, and a very small protocol
-for sending events to the client on top of the HTTP/1.1
-connection.
-
-EventSource is a lightweight solution that only works for
-UTF-8 encoded text data. Binary data and text data encoded
-differently are not allowed by the protocol. A heavier but
-more generic approach can be found in Websocket.
-
-Websocket
----------
-
-Websocket is a protocol built on top of HTTP/1.1 that provides
-a two-ways communication channel between the client and the
-server. Communication is asynchronous and can occur concurrently.
-
-It consists of a Javascript object allowing setting up a
-Websocket connection to the server, and a binary based
-protocol for sending data to the server or the client.
-
-Websocket connections can transfer either UTF-8 encoded text
-data or binary data. The protocol also includes support for
-implementing a ping/pong mechanism, allowing the server and
-the client to have more confidence that the connection is still
-alive.
-
-A Websocket connection can be used to transfer any kind of data,
-small or big, text or binary. Because of this Websocket is
-sometimes used for communication between systems.
-
-SPDY
-----
-
-SPDY is an attempt to reduce page loading time by opening a
-single connection per server, keeping it open for subsequent
-requests, and also by compressing the HTTP headers to reduce
-the size of requests.
-
-SPDY is compatible with HTTP/1.1 semantics, and is actually
-just a different way of performing HTTP requests and responses,
-by using binary frames instead of a text-based protocol.
-SPDY also allows the server to send extra responses following
-a request. This is meant to allow sending the resources
-associated with the request before the client requests them,
-saving latency when loading websites.
-
-SPDY is an experiment that has proven successful and is used
-as the basis for the HTTP/2.0 standard.
-
-Browsers make use of TLS Next Protocol Negotiation to upgrade
-to a SPDY connection seamlessly if the protocol supports it.
-
-The protocol itself has a few shortcomings which are being
-fixed in HTTP/2.0.
-
-HTTP/2.0
---------
-
-HTTP/2.0 is the long-awaited update to the HTTP/1.1 protocol.
-It is based on SPDY although a lot has been improved at the
-time of writing.
-
-HTTP/2.0 is an asynchronous two-ways communication channel
-between two endpoints.
-
-It is planned to be ready late 2014.