Update manual

A number of @todo also remain in this document.

The manual pages have been converted to Asciidoc and they
can be installed system-wide using make install-docs.

The asciidoc rules will be converted into an erlang.mk plugin
in the near future.

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+= gun(7)
+
+== Name
+
+gun - Erlang HTTP client with support for HTTP/1.1, SPDY and Websocket.
+
+== Dependencies
+
+The `gun` application uses the Erlang applications `ranch`
+for abstracting TCP and TLS over a common interface, and
+the `ssl` application for TLS support, required for HTTPS
+and SPDY support. In addition, Gun requires the `crypto`
+application (a dependency of `ssl`) for Websocket.
+
+These dependencies must be started for the `gun`
+application to work. In an embedded environment
+this means that they need to be started with the
+`application:start/{1,2}` function before the `gun`
+application is started.
+
+== Environment
+
+The `gun` application does not define any application
+environment configuration parameters.