update nbconvert docs about reveal.js

docs/source/interactive/nbconvert.rst

@@ -63,11 +63,21 @@ The currently supported export formats are:
   This generates a Reveal.js HTML slideshow.
   It must be served by an HTTP server.  The easiest way to get this is to add
   ``--post serve`` on the command-line.
-  If you want to use the speaker notes plugin, just add
-  ``--slide-notes=True`` on the command-line.
-  For low connectivity environments, you can use a local copy of the reveal.js library, 
-  just add ``--offline-slides=reveal.js`` on the command-line, and do not forget to move
-  your downloaded ``reveal.js`` library to the same folder where your slides are located.
+  For low connectivity environments, you can use a local copy of the reveal.js library.
+  This can be any relative URL, ``reveal.js`` being most likely.
+  Do not forget to move your downloaded ``reveal.js`` library to the same folder where your slides are located.
+  
+  Fetching the latest reveal.js from GitHub:
+  
+  .. sourcecode: bash
+  
+      curl -L https://github.com/hakimel/reveal.js/archive/master.tar.gz | tar -xzf -
+      mv reveal.js-master reveal.js
+      ipython nbconvert mynotebook --to slides --reveal-prefix=reveal.js
+  
+  .. note::
+  
+      If you want to use the speaker notes plugin, you must use a local reveal.js copy
   
 * ``--to markdown``