Updated readme (instruction how to install sphinx extensions)

git-svn-id: svn+ssh://dyadis.cs.arizona.edu/NDN-spec/spec-sphinx@95 c5937c81-b952-4fd9-96ba-3036b240b622
diff --git a/README.md b/README.md
index 1a4a69f..64651b8 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,9 @@
     sudo port install py27-sphinx
     sudo port selectsphinx py27-sphinx
 
+    sudo easy_install-2.7 sphinxcontrib-fulltoc
+    sudo easy_install-2.7 sphinxcontrib-bibtex
+
 - Install from source: http://sphinx-doc.org/install.html
 
 - Install from .pkg binary package: http://named-data.net/binaries/sphinx-doc-0.2.pkg
@@ -18,6 +21,9 @@
 
     sudo apt-get install python-sphinx
 
+    sudo easy_install sphinxcontrib-fulltoc
+    sudo easy_install sphinxcontrib-bibtex
+
 Compilation
 ===========