Fixed mathjax macro to be synced with the mathjax config in the live notebook.

IPython/nbconvert/templates/html/mathjax.tpl

@@ -2,14 +2,19 b''
     <!-- MathJax configuration -->
     <script type="text/x-mathjax-config">
     MathJax.Hub.Config({
-      tex2jax: {
-        inlineMath: [ ['$','$'], ["\\(","\\)"] ],
-        displayMath: [ ['$$','$$'], ["\\[","\\]"] ]
-      },
-      displayAlign: 'left', // Change this to 'center' to center equations.
-      "HTML-CSS": {
-        styles: {'.MathJax_Display': {"margin": 0}}
-      }
+        tex2jax: {
+            inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+            displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
+            processEscapes: true,
+            processEnvironments: true
+        },
+        // Center justify equations in code and markdown cells. Elsewhere
+        // we use CSS to left justify single line equations in code cells.
+        displayAlign: 'center',
+        "HTML-CSS": {
+            styles: {'.MathJax_Display': {"margin": 0}},
+            linebreaks: { automatic: true }
+        }
     });
     </script>
     <!-- End of mathjax configuration -->