Add Sphinx and sphinx-autobuild to development requirements.

docs/Makefile

@@ -128,3 +128,6 @@ doctest:
 	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
 	@echo "Testing of doctests in the sources finished, look at the " \
 	      "results in $(BUILDDIR)/doctest/output.txt."
+
+livehtml:
+	sphinx-autobuild -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html

requirements/development.txt

@@ -1,8 +1,14 @@
 # requirements/development.txt
 -r common.txt
+Sphinx==1.3.1
 Werkzeug==0.10.4
+
+django-debug-toolbar==1.3.2
 django-extensions==1.5.5
 django-rosetta==0.7.6
-transifex-client==0.10
-django-debug-toolbar==1.3.2
+
 ipython==4.0.0
+
+transifex-client==0.10
+
+sphinx-autobuild==0.5.2