Re-add troubleshooting section that got somehow removed.

Also add an introductory section on debugging.

docs/source/configuration.rst

@@ -245,7 +245,7 @@ auto_subscribe
 If true, the user will automatically subscribe back to any contact requests.
 
 auto_join_on_invite
---------------
+-------------------
 
 * Default:  ``false``
 

docs/source/index.rst

@@ -51,6 +51,7 @@ Table of Contents
    style_guide 
    theming
    translations
+   troubleshooting
    documentation
    builds
 

docs/source/troubleshooting.rst

@@ -0,0 +1,109 @@
+.. raw:: html
+
+    <div id="banner"><a href="https://github.com/jcbrand/converse.js/blob/master/docs/source/setup.rst">Edit me on GitHub</a></div>
+
+=============================
+Troubleshooting and debugging
+=============================
+
+.. contents:: Table of Contents
+   :depth: 2
+   :local:
+
+General tips on debugging Converse.js
+=====================================
+
+When debugging converse.js, always make sure that you pass in ``debug: true`` to
+the ``converse.initialize`` call.
+
+Converse.js will then log debug information to the browser's developer console.
+Open the developer console and study the data that is logged to it.
+
+`Strope.js <http://strophe.im/>`_ the underlying XMPP library which Converse.js
+uses, swallows errors, so that messaging can continue in cases where
+non-critical errors occur.
+
+This is a useful feature and provides more stability, but it makes debugging
+trickier, because the app doesn't crash when something goes wrong somewhere.
+
+That's why checking the debug output in the browser console is so important. If
+something goes wrong somewhere, the error will be logged there and you'll be
+able to see it.
+
+Additionally, Converse.js will in debug mode also log all XMPP stanzas
+(the XML snippets being sent between it and the server) to the console.
+This is very useful for debugging issues relating to the XMPP protocol.
+
+For example, if a message or presence update doesn't appear, one of the first
+things you can do is to set ``debug: true`` and then to check in the console
+whether the relevant XMPP stanzas are actually logged (which would mean that
+they were received by Converse.js). If they're not logged, then the problem is
+more likely on the XMPP server's end (perhaps a misconfiguration?). If they
+**are** logged, then there might be a bug or misconfiguration in Converse.js.
+
+
+Conflicts with other Javascript libraries
+=========================================
+
+Problem: 
+---------
+
+You are using other Javascript libraries (like JQuery plugins), and
+get errors like these in your browser console::
+
+    Uncaught TypeError: Object [object Object] has no method 'xxx' from example.js
+
+Solution:
+---------
+
+First, find out which object is referred to by ``Object [object Object]``.
+
+It will probably be the jQuery object ``$`` or perhaps the underscore.js object ``_``.
+
+For the purpose of demonstration, I'm going to assume its ``$``, but the same
+rules apply if its something else.
+
+The bundled and minified default build of converse.js, ``converse.min.js``
+includes within it all of converse.js's dependencies, which include for example *jQuery*.
+
+If you are having conflicts where attributes or methods aren't available 
+on the jQuery object, you are probably loading ``converse.min.js`` (which
+includes jQuery) as well as your own jQuery version separately.
+
+What then happens is that there are two ``$`` objects (one from
+converse.js and one from the jQuery version you included manually)
+and only one of them has been extended to have the methods or attributes you require.
+
+Which jQuery object you get depends on the order in which you load the libraries.
+
+There are multiple ways to solve this issue.
+
+Firstly, make sure whether you really need to include a separate version of
+jQuery. Chances are that you don't. If you can remove the separate
+version, your problem should be solved, as long as your libraries are loaded in
+the right order.
+
+Either case, whether you need to keep two versions or not, the solution depends
+on whether you'll use require.js to manage your libraries or whether you'll
+load them manually.
+
+With require.js
+~~~~~~~~~~~~~~~
+
+Instead of using ``converse.min.js``, manage all the libraries in your project
+(i.e. converse.js and its dependencies plus all other libraries you use) as one
+require.js project, making sure everything is loaded in the correct order.
+
+Then, before deployment, you make your own custom minified build that bundles everything
+you need.
+
+With <script> tags
+~~~~~~~~~~~~~~~~~~
+
+Take a look at `non_amd.html <https://github.com/jcbrand/converse.js/blob/master/non_amd.html>`_
+in the converse.js repo.
+
+It shows in which order the libraries must be loaded via ``<script>`` tags. Add
+your own libraries, making sure that they are loaded in the correct order (e.g.
+jQuery plugins must load after jQuery).
+