Provide a brief explanation of converse.js's dependencies.

docs/source/developer_guidelines.rst

@@ -95,9 +95,27 @@ to use it this way, please refer to
 for an example of how and in what order all the Javascript files that converse.js
 depends on need to be loaded.
 
-
-Before submitting a pull request
---------------------------------
+Brief description of converse.js's dependencies
+-----------------------------------------------
+
+Converse.js relies on the following dependencies:
+
+* [JQuery](http://jquery.com/) for DOM manipulation and [promises](http://api.jquery.com/promise/).
+* [moment.js](http://momentjs.com/) provides a better API for handling dates and times.
+* [Strophe.js](http://strophe.im/) maintains the XMPP session, is used to
+  build XMPP stanzas, to send them, and to register handlers for received stanzas.
+* [Underscore](http://underscorejs.org/) provides very useful utility functions.
+* [Backbone](http://backbonejs.org/) is used to model the data as Models and
+  Collections and to create Views that render the UI.
+* [backbone.overview](http://github.com/jcbrand/backbone.overview) provides
+  Overviews, which are to Views as Backbone Collections are to Models.
+* [pluggable.js](https://github.com/jcbrand/pluggable.js) is the plugin
+  architecture for Converse.js. It registers and initializes plugins and
+  allows existing attributes, functions and objects on converse.js to be
+  overridden inside plugins.
+
+When submitting a pull request
+------------------------------
 
 Please follow the usual github workflow. Create your own local fork of this repository,
 make your changes and then submit a pull request.