wire session 8 and 9 into the index again

cewing · cewing · commit 4b02a2f6ae1b · 2015-02-22T01:19:42.000-08:00
diff --git a/source/presentations/index.rst b/source/presentations/index.rst
@@ -22,3 +22,5 @@ course.
    session05
    session06
    session07
+   session08
+   session09
