Update logos and fix typos

Author: SylvainCorlay

2017-06-11-pyparis-keynote/src/index.html

@@ -563,7 +563,7 @@ <h2>Demo</h2>
                 </section>
 
                 <section>
-                    <h3>The HTPP of Scientific Computing</h3>
+                    <h3>The HTTP of Scientific Computing</h3>
                     <em>A specification matters a great deal more than any implementation.</em>
                     <div style="text-align: left; font-size: 36px; width: 70%; margin-left: auto; margin-right: auto;">
                     <p>Well specified</em>