Fix variable name in spawn function. Added working with json, upload examples and install&configuration documentation

doc/greet-json.rst

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+Working with JSON
+==================
+
+Nowadays webservices are json based so making your script json aware is probably
+a good chioce. In order to be able to extract data from and compose json
+documents from a script you can use
+`jq <https://https://stedolan.github.io/jq/>`_.
+
+In this example we extract the name field from the incomming json document in
+order to generate a two attribute json response.
+
+.. code-block:: bash
+
+  who=$(kapow get /request/body | jq -r .name)
+  kapow set /response/headers/Content-Type "application/json"
+  kapow set /response/status 200
+  jq --arg greet "Hello" --arg value "${who:-World}" -n \{greet:\$greet\,to:\$value\} | kapow set /response/body

doc/install-and-configure.rst

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+Installing Kapow!
+=================
+
+Kapow! has a reference implementation in Go that is under active develpment
+right now.  If you want to start using Kapow! you can:
+- Download a binary (linux, at this moment) from our
+`releases <https://github.com/BBVA/kapow/releases>`_ section
+- Install the package with the get command (you need the Go runtime installed
+and `configured <https://golang.org/cmd/go/>`)
+
+.. code-block:: bash
+
+    go get -u github.com/BBVA/kapow
+
+Using Kapow!
+============
+
+Kapow! binary gives you both, a way to start the server and a command line
+client to interact with it.
+
+Running the server
+------------------
+
+You start a Kapow! server by using the server command ``kapow server``.  It
+automatically binds the three HTTP modules when it starts:
+
+- The control server: Used to manage the user defined routes.  It exposes the
+control API and listens by default in the loopback interface at port 8081.  You
+can change this configurtation by ussing the
+--control-bind <listen_address>:<listen_port> parameter.
+- The data server: Allows access to the resources tree to the scripts triggered
+by user's requests.  It exposes the control API and listens by default in the
+loopback interface at port 8082.  You can change this configurtation by ussing
+the --data-bind <listen_address>:<listen_port> parameter.
+- The ``user server``: This server is the one that makes available to the
+outside all the routes configured through the control server.  It listens by
+default in the port 8080 of all configured interfaces (0.0.0.0). You can change this
+configurtation by ussing the --bind <listen_address>:<listen_port> parameter.
+
+
+
+********--------********--------********----------------********--------********--------********
+
+You start a Kapow! server by using the server command ``kapow server``.  You can
+configure the listen address of the different modules by using the
+corresponding parameters:
+
+- --control-bind <listen_address>:<listen_port>: Allows to manage the user
+defined routes.  Defaults to 'localhost:8081' (loopback interface).
+- --data-bind <listen_address>:<listen_port>: Allows access to the resources
+tree to the scripts triggered by user's requests.  Defailts to 'localhost:8081'
+(loopback interface).
+- --bind <listen_address>:<listen_port>: Publishes the routes configured
+through the control server to the outside world.  Defaults to '0.0.0.0:8080'
+(all configured host's interfaces.)
+
+
+Managing routes
+---------------
+
+Kapow!'s route command allows us to manage the routes that we want to publish
+to the outside world.  In order to contact with the desired Kapow! server you
+can use the ``--control-url`` command line parameter or the KAPOW_CONTROL_URL
+environmental variable to set the correct value.
+
+In the same way the ``--data-url`` command line parameter or the KAPOW_DATA_URL
+environmental variable will allow you to set to set the server listen address
+when accesing the data server, although this case is less frequent.

doc/upload.rst

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+Upload a file
+=============
+
+HTTP request allows us to send and receive files by using the Multipart standard.
+
+Kapow! allow us to handle files received in the request. In this example we
+respond back with the line count of the file received in the request.
+
+.. code-block:: bash
+
+  fname=$(kapow get /request/files/myfile/filename)
+  lcount=$(kapow get /request/files/myfile/content | wc -l)
+  kapow set /response/status 200
+  echo "$fname has $lcount lines" | kapow set /response/body
+
+You can try this by using the following curl:
+
+.. code-block:: bash
+
+  curl -F "myfile=@README.rst" http://localhost:8080/linecount