upgraded to express 3.x, converted jade templates, and worked out array notation for articles/exercises

test/views/session/new.jade

@@ -1,11 +1,14 @@
-h1 Log in
+extends ../layout
 
-form(method="POST", action="/session")
-  p
-    label(for="username") User name:<br />
-    input#username(name="username")
-  p
-    label(for="password") Password:<br />
-    input#password(type="password", name="password")
-  p
-    input(type="submit", value="Log in");
+block content
+  h1 Log in
+
+  form(method="POST", action="/session")
+    p
+      label(for="username") User name:<br />
+      input#username(name="username")
+    p
+      label(for="password") Password:<br />
+      input#password(type="password", name="password")
+    p
+      input(type="submit", value="Log in");