[Docs] Reorganise and add sections from wiki

- Change the layout and contents of docs to be better organised and
  follow ideas from: https://www.divio.com/blog/documentation/
- Use markdown for non-technical documents to speed up writing.
- Added new sections and imported documents from Trac wiki.

Build fixes:

- Added a patch to fix recommonmark 0.4 and doc referencing:
    https://github.com/rtfd/recommonmark/issues/93
- Set docs build in tox to Py2.7 since there are problems with autodoc
  mocking multiple inheritance on Python 3 resulting in metaclass errors.
- Supressed warning about `modules.rst` not in the toctree by creating
  a static `modules.rst` with `:orphan:` file directive and add to git.
  Also skip creating this toc file with sphinx-apidoc in setup and tox.
- Simplified finding exported RPC and JSON API methods by adding an
  autodoc custom class directive. Removed unneeded __rpcapi.py.

docs/source/devguide/how-to/curl-jsonrpc.md

@@ -0,0 +1,162 @@
+# How to connect to JSON-RPC with curl
+
+Before continuing make sure deluge-web or webui plugin is running.
+
+## Create a curl config
+
+To save a lot of typing and to keep the curl command short we shall create
+a `curl.cfg` files and put the following contents in it:
+
+    request = "POST"
+    compressed
+    cookie = "cookie_deluge.txt"
+    cookie-jar = "cookie_deluge.txt"
+    header = "Content-Type: application/json"
+    header = "Accept: application/json"
+    url = "http://localhost:8112/json"
+    write-out = "\n"
+
+To pretty-print the JSON result see: https://stackoverflow.com/q/352098/175584
+
+## Login to WebUI
+
+Login to the WebUI and get session cookie:
+
+    curl -d '{"method": "auth.login", "params": ["deluge"], "id": 1}' -K curl.cfg
+
+Result is `true` to signify that login was successful:
+
+    {
+        "error": null,
+        "id": 1,
+        "result": true
+    }
+
+Check the contents of the cookie file to verify session ID created.
+
+    cat cookie_deluge.txt
+    # Netscape HTTP Cookie File
+    # http://curl.haxx.se/docs/http-cookies.html
+    # This file was generated by libcurl! Edit at your own risk.
+
+    localhost	FALSE	/json	FALSE	1540061203	_session_id	<session_id>
+
+## Check connected to deluged
+
+Use the `web.connected` method to get a boolean response if the webui is
+connected to a deluged host:
+
+    curl -d '{"method": "web.connected", "params": [], "id": 1}' -K curl.cfg
+
+Result is `false` because WebUI is not yet connected to the daemon:
+
+    {
+        "error": null,
+        "id": 1,
+        "result": false
+    }
+
+## Get list of deluged hosts
+
+Use the `web.get_hosts` method:
+
+    curl -d '{"method": "web.get_hosts", "params": [], "id": 1}' -K curl.cfg
+
+The result contains the `<hostID>` for using in request `params` field.
+
+    {
+        "error": null,
+        "id": 1,
+        "result": [
+            [
+                "<hostID>",
+                "127.0.0.1",
+                58846,
+                "localclient"
+            ]
+        ]
+    }
+
+## Get the deluged host status
+
+    curl -d '{"method": "web.get_host_status", \
+    "params": ["<hostID>"], "id": 1}' -K curl.cfg
+
+The result shows the version and status; _online_, _offline_ or _connected_.
+
+    {
+        "error": null,
+        "id": 1,
+        "result": [
+            "<hostID>",
+            "Online",
+            "2.0.0"
+        ]
+    }
+
+## Connect to deluged host
+
+To connect to deluged with `<hostID>`:
+
+    curl -d '{"method": "web.connect", \
+    "params": ["<hostID>"], "id": 1}' -K curl.cfg
+
+The result contains the full list of avaiable host methods:
+
+    {
+        "error": null,
+        "id": 1,
+        "result": [
+            "core.add_torrent_url",
+            ...
+            "core.upload_plugin"
+        ]
+    }
+
+## Disconnect from host
+
+    curl -d '{"method": "web.disconnect", "params": [], "id": 1}' -K curl.cfg
+
+A successful result:
+
+    {
+        "error": null,
+        "id": 1,
+        "result": "Connection was closed cleanly."
+    }
+
+## Add a torrent
+
+    curl -d '{"method": "web.add_torrents", "params": \
+    [[{"path":"/tmp/ubuntu-12.04.1-desktop-amd64.iso.torrent", \
+    "options":null}]], "id": 1}' -K curl.cfg
+
+## Add a magnet URI
+
+    curl-d '{"method": "core.add_torrent_magnet", \
+    "params": ["<magnet_uri>", {}], "id": 1}' -K curl.cfg
+
+## Get list of files for a torrent
+
+    curl -d '{"method": "web.get_torrent_files", \
+    "params": ["<torrentid>"], "id": 1}' -K curl.cfg
+
+## Set a core config option
+
+    curl -d '{"method": "core.set_config", \
+    "params":[{"max_upload_slots_global":"200"}], "id": 1}' -K curl.cfg
+
+    {"error": null, "result": null, "id": 1}
+
+## Useful curl config options
+
+For full list of options see man page `man curl` or help `curl --help`:
+
+    --cookie (-b) # Load cookie file with session id
+    --cookie-jar (-c) # Save cookie file with session id
+    --compressed # responses are gzipped
+    --include (-i) # Include the HTTP header in output (optional)
+    --header (-H) # HTTP header
+    --request (-X) # custom request method
+    --data (-d) # data to send in POST request '{"method": "", "params": [], "id": ""}'
+    --insecure (-k) # use with self-signed certs https

docs/source/devguide/how-to/index.md

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+# How-to guides
+
+This is a collection of guides for specific issues or cover more details than
+the tutorials.
+
+## Web JSON-RPC
+
+- [Connect to JSON-RPC using curl](curl-jsonrpc.md)